Allowing country + category searches for news.

The newsapi allows news queries with both country and category parameters in
the payload. However, it doesn't allow country and source or category and
source mixed parameters. The update to the code reflects the corrected
parameter options.

Author: arnmishra

newsapi/newsapi_client.py

@@ -50,17 +50,17 @@ def get_top_headlines(self, q=None, sources=None, language=None, country=None, c
             else:
                 raise TypeError('keyword/phrase q param should be a str')
 
-                # Sources
+        # Sources 
+        if (sources is not None) and ((country is not None) or (category is not None)):
+            raise ValueError('cannot mix country/category param with sources param.')
+
+        # Sources
         if sources is not None:
             if type(sources) == str:
                 payload['sources'] = sources
             else:
                 raise TypeError('sources param should be a str')
 
-        # Sources 
-        if (country is not None) and (category is not None):
-            raise ValueError('cannot mix country/category param with sources param.')
-
         # Language 
         if language is not None:
             if type(language) == str: