Add config instructions for HTTPS and reverse proxies

Author: russelldavis

README.rst

@@ -19,6 +19,17 @@ Ensure you've configured GitHub auth in Sentry::
     GITHUB_API_SECRET = '
     GITHUB_EXTENDED_PERMISSIONS = ['repo']
 
+If your Sentry server is using HTTPS, you'll need this in your config::
+
+    SOCIAL_AUTH_REDIRECT_IS_HTTPS = True
+    
+If your server is behind a reverse proxy, you'll need to enable the X-Forwarded-Proto
+and X-Forwarded-Host headers, and use this config::
+
+    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
+    USE_X_FORWARDED_HOST = True
+
+
 Associate your account with GitHub (if you haven't already) via Account -> Identities. If you had
 already associated your account, and you hadn't configured extended permissions, you'll need to
 disconnect and reconnect the account.