Added ability to override time zone for every session (fixes #184)

[vania-pooh]

No description provided.

[codecov-io]

Codecov Report

Merging #188 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   75.33%   75.33%           
=======================================
  Files           5        5           
  Lines         669      669           
=======================================
  Hits          504      504           
- Misses        143      145    +2     
+ Partials       22       20    -2

Flag	Coverage Δ
#unittests	75.33% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
session/session.go	100% <ø> (ø)	⬆️
selenoid.go	74.78% <0%> (ø)	⬆️

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