I forgot one error string for the Android readFile() method (#475)

* bump to 0.10.8

* Update PULL_REQUEST_TEMPLATE

* Forgot to normalize the error message of readFile

Author: LionessTester

android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java

@@ -189,7 +189,7 @@ else if(resolved == null) {
             }
         }
         catch(Exception err) {
-            promise.reject("ReadFile Error", err.getLocalizedMessage());
+            promise.reject("RNFetchBlob readFile error", err.getLocalizedMessage());
         }
 
     }