Scheduled monthly dependency update for November (#76)

* Update green from 2.12.1 to 2.13.0

* Update pytest from 3.8.1 to 3.9.3

* Update pydocstyle from 2.1.1 to 3.0.0

* Update radon from 2.2.0 to 2.4.0

* Pin emoji to latest version 0.5.1

* Update cairosvg from 2.1.3 to 2.2.1

* Update yamllint from 1.11.1 to 1.12.1

* Update watson-developer-cloud from 2.1.0 to 2.4.0

* Update sphinx_rtd_theme from 0.4.1 to 0.4.2

requirements.txt

@@ -1,18 +1,18 @@
 python-telegram-bot==11.1.0
-green==2.12.1
-pytest==3.8.1
+green==2.13.0
+pytest==3.9.3
 pycodestyle==2.4.0
-pydocstyle==2.1.1
+pydocstyle==3.0.0
 chatterbot==0.8.7
-radon==2.2.0
+radon==2.4.0
 codecov==2.0.15
-emoji
+emoji==0.5.1
 pygal==2.4.0
 cairocffi==0.9.0
-CairoSVG==2.1.3
+CairoSVG==2.2.1
 invoke==1.2.0
-yamllint==1.11.1
-watson-developer-cloud==2.1.0
+yamllint==1.12.1
+watson-developer-cloud==2.4.0
 sphinx==1.8.1
 sphinx-autobuild==0.7.1
-sphinx_rtd_theme==0.4.1
+sphinx_rtd_theme==0.4.2