bump to 0.3

Author: 38

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "plotters-bitmap"
-version = "0.2.0"
+version = "0.3.0"
 authors = ["Hao Hou <haohou302@gmail.com>"]
 edition = "2018"
 license = "MIT"
@@ -12,7 +12,7 @@ readme = "README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-plotters-backend = "0.2.*"
+plotters-backend = "0.3.*"
 gif = { version = "0.10.3", optional = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies.image]