Multiple changs for a new release

[abhishek-ram]

• Use github actions instead of travis ci
• Upgrade pyas2lib version to 1.4.0
• Add support for python 3.10
• Remove support for python 3.6

[codecov[bot]]

Codecov Report

Merging #70 (d2851e3) into master (b7a7bdb) will decrease coverage by 0.15%. The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   97.60%   97.44%   -0.16%     
==========================================
  Files          11       11              
  Lines         584      587       +3     
==========================================
+ Hits          570      572       +2     
- Misses         14       15       +1     

Impacted Files	Coverage Δ
pyas2/management/commands/sendas2bulk.py	100.00% <ø> (ø)
pyas2/views.py	97.18% <80.00%> (-0.66%)	:arrow_down:
pyas2/management/commands/manageas2server.py	98.66% <100.00%> (ø)
pyas2/management/commands/sendas2message.py	100.00% <100.00%> (ø)
pyas2/models.py	96.12% <100.00%> (ø)
pyas2/utils.py	100.00% <100.00%> (ø)

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