VOL-1104: typed_ast Python dependency

version of pylint requirement changed to 1.7.6 to fix build issue

Change-Id: I65dbcf1f148b5343f7f55c7d92bf8fcd2efb6aa2
diff --git a/requirements.txt b/requirements.txt
index 39e89a8..a0641b2 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@
 protobuf==3.3.0
 protobuf-to-dict==0.1.0
 pyflakes==1.6.0
-pylint==1.7.4
+pylint==1.7.6
 #pypcap>=1.1.5
 pyOpenSSL==17.3.0
 PyYAML==3.12