bumped srgutil to 0.1.7 to fix python 2.7 problems

requirements.txt

@@ -260,8 +260,8 @@ more-itertools==4.2.0 \
 moto==1.3.3 \
     --hash=sha256:45d14aca2b06b0083d5e82cfd770ebca0ba77b5070aec6928670240939a78681 \
     --hash=sha256:ee71b515ba34d64c5f625950fc995594040f793a4a106614ff108ae02c1a2896
-mozilla-srgutil==0.1.6 \
-    --hash=sha256:e02d46d94bbf4b7cb88dd6e780c98890dafee50259e9faa655dd456bd2a18115
+mozilla-srgutil==0.1.7 \
+    --hash=sha256:b28a8a779500e7700d63eb1cdf4d1c5f83676209df6721103be682441f9ab51a
 numpy==1.14.3 \
     --hash=sha256:0074d42e2cc333800bd09996223d40ec52e3b1ec0a5cab05dacc09b662c4c1ae \
     --hash=sha256:034717bfef517858abc79324820a702dc6cd063effb9baab86533e8a78670689 \