Merge pull request #7568 from docker/dependabot/pip/distlib-0.3.1

Bump distlib from 0.3.0 to 0.3.1

requirements-indirect.txt

@@ -4,7 +4,7 @@ attrs==19.3.0
 bcrypt==3.1.7
 cffi==1.14.0
 cryptography==2.9.2
-distlib==0.3.0
+distlib==0.3.1
 entrypoints==0.3
 filelock==3.0.12
 gitdb2==4.0.2