[enh] version 0.13.1

CHANGELOG.rst

+0.13.1 2017.11.23
+=================
+
+- Bug fixes
+
+  - https://github.com/asciimoo/searx/issues/1088
+  - https://github.com/asciimoo/searx/issues/1089
+
+- Dependency updates
+
+
 0.13.0 2017.11.21
 =================
 

searx/version.py

 # version of searx
 VERSION_MAJOR = 0
 VERSION_MINOR = 13
-VERSION_BUILD = 0
+VERSION_BUILD = 1
 
 VERSION_STRING = "{0}.{1}.{2}".format(VERSION_MAJOR,
                                       VERSION_MINOR,