fix(headers): don't proxy content-md5 and content-type (#300)

Author: ricardogobbosouza

lib/module.js

@@ -58,7 +58,7 @@ function axiosModule (_moduleOptions) {
     debug: false,
     progress: true,
     proxyHeaders: true,
-    proxyHeadersIgnore: ['accept', 'host', 'cf-ray', 'cf-connecting-ip', 'content-length'],
+    proxyHeadersIgnore: ['accept', 'host', 'cf-ray', 'cf-connecting-ip', 'content-length', 'content-md5', 'content-type'],
     proxy: false,
     retry: false,
     https,