Add header support

gitmon/api.py

@@ -6,13 +6,15 @@ from requests.packages.urllib3.util.retry import Retry
 
 
 class GitHubApi:
-    def __init__(self, proxy=None):
+    def __init__(self, headers=None, proxy=None):
         self.base_url = 'https://api.github.com'
         self.session = requests.Session()
 
         retries = Retry(total=3, backoff_factor=1)
         self.session.mount('https://', HTTPAdapter(max_retries=retries))
 
+        if headers:
+            self.session.headers.update(headers)
         if proxy:
             self.session.proxies.update(proxy)