Added remove method for invalidate a cached call. Closes #3

CHANGELOG.md

@@ -0,0 +1,2 @@
+# NEXT
+    - Added `remove` method for invalidate a cached call.

README.md

@@ -75,13 +75,14 @@ dependencies {
     retrofitBuilder.addCallAdapterFactory(new CachedCallFactory(mCache));
     ```
 
-4. Use it as normal retrofit. Just remember to use `CachedCall`. All retrofit methods are included, and you can also call `refresh(callback)` to avoid looking in the cache.
+4. Use it as normal retrofit. Just remember to use `CachedCall`. All retrofit methods are included, and you can also call `refresh(callback)` to avoid looking in the cache or `remove()` to invalidate a cached call.
 
     ```java
        CachedCall<MyObject> call = ...
        call.refresh(new Callback<MyObject>() {
            ...
        });
+       call.remove();
     ```
 
 # Pull Requests

retrocache/src/main/java/com/andiag/retrocache/CachedCallImpl.java

@@ -233,6 +233,11 @@ public Response<T> execute() throws IOException {
         return mCall.execute();
     }
 
+    @Override
+    public void remove() {
+        mCachingSystem.remove(ResponseUtils.urlToKey(mCall.request().url()));
+    }
+
     @Override
     public void cancel() {
         mCall.cancel();

retrocache/src/main/java/com/andiag/retrocache/interfaces/CachedCall.java

@@ -26,4 +26,9 @@ public interface CachedCall<T> extends Call<T>, Cloneable {
      */
     Type responseType();
 
+    /**
+     * Remove a cached call if exists
+     */
+    void remove();
+
 }