Merge pull request #66 from optimizely/devel

Fix javadoc for Cache class. (#65)

Author: mikeproeng37

shared/src/main/java/com/optimizely/ab/android/shared/Cache.java

@@ -54,8 +54,7 @@ public Cache(@NonNull Context context, @NonNull Logger logger) {
      * Load the cache file
      *
      * @param fileName the path to the file
-     * @return the loaded cache file as String
-     * @throws IOException if file can't be loaded
+     * @return the loaded cache file as String or null if the file cannot be loaded
      * @hide
      */
     @Nullable