Bump pygments from 2.4.2 to 2.7.4 (#70)

Author: dependabot[bot]

requirements.txt

@@ -26,7 +26,7 @@ pkginfo==1.5.0.1
 pluggy==0.13.0
 protobuf==3.14.0 --no-binary=protobuf
 py==1.8.0
-Pygments==2.4.2
+Pygments==2.7.4
 pylint==2.6.0
 pyparsing==2.4.2
 pysodium==0.7.2