Add circleci 2 support

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[codecov-io]

Codecov Report

Merging #1198 into master will decrease coverage by 3.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1198      +/-   ##
==========================================
- Coverage   54.69%   51.34%   -3.35%     
==========================================
  Files          42       42              
  Lines        7652     7652              
==========================================
- Hits         4185     3929     -256     
- Misses       2939     3210     +271     
+ Partials      528      513      -15

Impacted Files	Coverage Δ
dialect_postgres.go	11.65% <0%> (-64.08%)	⬇️
logger.go	55.07% <0%> (-5.8%)	⬇️
session_insert.go	56.12% <0%> (-4.34%)	⬇️
xorm.go	63.07% <0%> (-3.08%)	⬇️
session_raw.go	54.54% <0%> (-3.04%)	⬇️
engine_table.go	78.26% <0%> (-2.9%)	⬇️
session_update.go	50.31% <0%> (-2.23%)	⬇️
session_query.go	59.57% <0%> (-2.13%)	⬇️
convert.go	26.98% <0%> (-1.99%)	⬇️
session.go	56.09% <0%> (-1.75%)	⬇️
... and 2 more

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