Add changelog

Author: mpalourdio

CHANGELOG.MD

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+## v0.5.0
+
+The module is now splitted in sub-modules for more convenience. See [usage](https://github.com/mpalourdio/ng-http-loader#usage).  
+It's an **opt-in** feature. The "old" module import method, by simply declaring ``NgHttpLoaderModule``, is still fully supported. 
+
+**BC break** : paths of components and services have changed.
+- Components are now located in the ``components`` folders.
+- Services are now located in the ``services`` folders.
+
+## v0.4.0
+
+Added **angular 5** full support. The last version compatible with angular 4 is ``version 0.3.4``
+
+## v0.3.4
+
+Fixed default spinners background.
+
+## v0.3.0
+
+This release gives the possibility to filter http requests that should not be handled by the interceptor by providing an array of URL regex to the component's ``filteredUrlPatterns`` property.
+
+## v0.2.0
+
+Definitely switch to the new HttpClientModule api available from angular 4.3
+
+## v0.1.0
+
+Before completely removing HttpInterceptorService, provide a parallel implementation based on the new built-in angular 4.3 intercepto