Improve README and requierments.txt

requirements.txt

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+appdirs==1.4.4
+apprise==0.8.9
+certifi==2020.12.5
+chardet==3.0.4
+click==7.1.2
+idna==2.10
+Markdown==3.3.3
+mccabe==0.6.1
+mypy-extensions==0.4.3
+oauthlib==3.1.0
+pathspec==0.8.1
+pyasn1==0.4.8
+pycodestyle==2.6.0
+pydocstyle==5.1.1
+pyflakes==2.2.0
+PyYAML==5.3.1
+regex==2020.11.13
+requests==2.25.0
+requests-oauthlib==1.3.0
+six==1.15.0
+sleekxmpp==1.3.3
+snowballstemmer==2.0.0
+toml==0.10.2
+typed-ast==1.4.1
+typing-extensions==3.7.4.3
+urllib3==1.26.2