Need a main()

#531

httpie/__main__.py

@@ -5,9 +5,13 @@
 import sys
 
 
-if __name__ == '__main__':
+def main():
     try:
         from .core import main
         sys.exit(main())
     except KeyboardInterrupt:
         sys.exit(1)
+
+
+if __name__ == '__main__':
+    main()

tests/test_regressions.py

@@ -11,7 +11,7 @@ def test_Host_header_overwrite(httpbin):
 
     """
     host = 'httpbin.org'
-    url = httpbin.url + '/get'
+    url = httpbin.url + '/set?k2=v2&k1=v1'
     r = http('--print=hH', url, 'host:{0}'.format(host))
     assert HTTP_OK in r
     assert r.lower().count('host:') == 1