Freshen up package requirements

README.md

@@ -1,3 +1,7 @@
 # o365-mail-filter
 
 ... because spam takes many forms.
+
+## Requirements
+
+- Python 3.7 or 3.8

requirements.txt

@@ -1,24 +1,17 @@
-backports.zoneinfo==0.2.1
-beautifulsoup4==4.9.3
-boto3==1.18.35
-botocore==1.21.35
-certifi==2021.5.30
-chardet==4.0.0
-charset-normalizer==2.0.4
-docutils==0.17.1
-idna==3.2
-jmespath==0.10.0
-O365==2.0.15
+beautifulsoup4==4.10.0
+certifi==2021.10.8
+charset-normalizer==2.0.7
+idna==3.3
+O365==2.0.16
 oauthlib==3.1.1
 pendulum==2.1.2
 python-dateutil==2.8.2
-pytz==2021.1
+pytz==2021.3
 pytzdata==2020.1
 requests==2.26.0
 requests-oauthlib==1.3.0
-s3transfer==0.5.0
 six==1.16.0
 soupsieve==2.2.1
 stringcase==1.2.0
-tzlocal==3.0
-urllib3==1.26.6
+tzlocal==2.1
+urllib3==1.26.7