Resolve security vulnerabilities

requirements.txt

@@ -1,6 +1,7 @@
-bleach==3.1.4
+bleach==4.1.0
 certifi==2018.11.29
 chardet==3.0.4
+charset-normalizer==2.0.4
 colorama==0.3.9
 coverage==5.3
 docutils==0.14
@@ -12,19 +13,21 @@ isort==4.3.4
 mando==0.6.4
 mccabe==0.6.1
 nose==1.3.7
+packaging==21.0
 pkginfo==1.5.0.1
 pycodestyle==2.4.0
 pyflakes==2.0.0
-Pygments==2.3.1
+Pygments==2.10.0
+pyparsing==2.4.7
 radon==2.2.0
 readme-renderer==24.0
 rednose==1.3.0
-requests==2.21.0
+requests==2.26.0
 requests-toolbelt==0.9.1
 six==1.10.0
 termstyle==0.1.11
 testfixtures==5.4.0
 tqdm==4.31.1
 twine==1.13.0
-urllib3==1.24.2
+urllib3==1.26.6
 webencodings==0.5.1