Fix changelog header structure

Author: dhonx

CHANGELOG.md

@@ -4,12 +4,12 @@
 
 - [PR #66](https://github.com/v-community/v_by_example/pull/66) Update .typo-ci.yml [@dhonx](https://github.com/dhonx)
 
-## Enhancement
+### Enhancement
 
 - [PR #63](https://github.com/v-community/v_by_example/pull/63) Add Typo CI [@Delta456](https://github.com/Delta456)
 - [PR #62](https://github.com/v-community/v_by_example/pull/62) remove unused newline [@Delta456](https://github.com/Delta456)
 
-## Documentation
+### Documentation
 
 - [PR #69](https://github.com/v-community/v_by_example/pull/69) using 4 spaces for indentation & format table [@dhonx](https://github.com/dhonx)
 - [PR #68](https://github.com/v-community/v_by_example/pull/68) update variadic function, fix typo & improve grammar [@dhonx](https://github.com/dhonx)
@@ -25,7 +25,7 @@
 
 ## v0.6.0 (2019-11-03)
 
-## Documentation
+### Documentation
 
 - [PR #58](https://github.com/v-community/v_by_example/pull/58) add comma and remove some whitespaces [@dhonx](https://github.com/dhonx)
 - [PR #57](https://github.com/v-community/v_by_example/pull/57) array: add how to create an empty array [@dhonx](https://github.com/dhonx)
@@ -34,82 +34,82 @@
 - [PR #38](https://github.com/v-community/v_by_example/pull/38) Improve contributing [@vbrazo](https://github.com/vbrazo)
 - [PR #37](https://github.com/v-community/v_by_example/pull/37) Fix broken README links [@vbrazo](https://github.com/vbrazo)
 
-## Feature request
+### Feature request
 
 - [PR #59](https://github.com/v-community/v_by_example/pull/59) Add JSON example [@vbrazo](https://github.com/vbrazo)
 
 ------------------------------------------------------------------------------
 
 ## v0.5.0 (2019-10-24)
 
-## Bug
+### Bug
 
 - [PR #32](https://github.com/v-community/v_by_example/pull/32) More typos [@ksaj](https://github.com/ksaj)
 - [PR #31](https://github.com/v-community/v_by_example/pull/31) Exponent typo [@ksaj](https://github.com/ksaj)
 
-## Chores
+### Chores
 
 - [PR #33](https://github.com/v-community/v_by_example/pull/33) Grammar [@ksaj](https://github.com/ksaj)
 - [PR #24](https://github.com/v-community/v_by_example/pull/24) Minor fixes [@vbrazo](https://github.com/vbrazo)
 - [PR #23](https://github.com/v-community/v_by_example/pull/23) Missing 'or' [@ksaj](https://github.com/ksaj)
 
-## Feature Request
+### Feature Request
 
 - [PR #26](https://github.com/v-community/v_by_example/pull/26) Follow #25 and more progress [@Delta456](https://github.com/Delta456)
 
 ------------------------------------------------------------------------------
 
 ## v0.4.0 (2019-10-13)
 
-## Chores
+### Chores
 
 - [PR #23](https://github.com/v-community/v_by_example/pull/23) hello.md: formatting [@dhonx](https://github.com/dhonx)
 
-## Feature Request
+### Feature Request
 
 - [PR #20](https://github.com/v-community/v_by_example/pull/20) example: functions, arrays, structures etc [@vbrazo](https://github.com/vbrazo)
 
 ------------------------------------------------------------------------------
 
 ## v0.3.0 (2019-10-12)
 
-## Chores
+### Chores
 
 - [PR #18](https://github.com/v-community/v_by_example/pull/18) update primitives.md [@dhonx](https://github.com/dhonx)
 - [PR #17](https://github.com/v-community/v_by_example/pull/17) Update repo structure [@vbrazo](https://github.com/vbrazo)
 
-## Documentation
+### Documentation
 
 - [PR #16](https://github.com/v-community/v_by_example/pull/16) Fix Discord link [@vbrazo](https://github.com/vbrazo)
 
-## Feature Request / Enhancement
+### Feature Request / Enhancement
 
 - [PR #19](https://github.com/v-community/v_by_example/pull/19) example: conditional statements like if, else, else if, for and while [@vbrazo](https://github.com/vbrazo)
 
 ------------------------------------------------------------------------------
 
 ## v0.2.0 (2019-10-06)
 
-## Feature Request / Enhancement
+### Feature Request / Enhancement
 
 - [PR #14](https://github.com/v-community/v_by_example/pull/14) Primitives, Variables, Operators and Mutability [@Delta456](https://github.com/Delta456)
 
 ## v0.1.1 (2019-09-30)
 
-## Documentation
+### Documentation
 
 - [PR #7](https://github.com/v-community/v_by_example/pull/7) Add october.plan [@vbrazo](https://github.com/vbrazo)
 - [PR #6](https://github.com/v-community/v_by_example/pull/6) Add CONTRIBUTING [@vbrazo](https://github.com/vbrazo)
 - [PR #5](https://github.com/v-community/v_by_example/pull/5) add a final newline at the end of file [@dhonx](https://github.com/dhonx)
 
-## Chores
+### Chores
 
 - [PR #12](https://github.com/v-community/v_by_example/pull/12) ignore executable chores [@dhonx](https://github.com/dhonx)
 
 ------------------------------------------------------------------------------
 
 ## v0.1.0 (2019-09-26)
 
-## Feature Request / Enhancement
+### Feature Request / Enhancement
 
 - [PR #1](https://github.com/v-community/v_by_example/pull/1) README.md with first example [@Delta456](https://github.com/Delta456)