remove jsbeautifier dependency

mitmproxy/contrib/README

@@ -1,14 +1,9 @@
 
 Contribs:
 
-jsbeautifier, git checkout 25/03/12, MIT license
-    - Removed test directories
-    - Disabled packers through a single-line modification (see "# CORTESI"
-    comment)
-
 wbxml
     - https://github.com/davidpshaw/PyWBXMLDecoder
 
 tls, BSD license
     - https://github.com/mhils/tls/tree/mitmproxy
-    - limited to required files.
+    - limited to required files.

setup.py

@@ -68,7 +68,6 @@
         "h2>=3.0, <4",
         "html2text>=2016.1.8, <=2016.9.19",
         "hyperframe>=5.0, <6",
-        "jsbeautifier>=1.6.3, <1.7",
         "kaitaistruct>=0.7, <0.8",
         "ldap3>=2.2.0, <2.4",
         "passlib>=1.6.5, <1.8",