V6.0.0 rc

[doug-martin]

• Updated go support to 1.10, 1.11 and 1.12
• Change testify dependency from c2fo/testify back to stretchr/testify.
• Add support for "FOR UPDATE" and "SKIP LOCKED" #62 - @btubbs
• Changed to use go modules

[codecov]

Codecov Report

Merging #80 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #80   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          17       17           
  Lines        2219     2219           
=======================================
  Hits         1797     1797           
  Misses        313      313           
  Partials      109      109

Impacted Files	Coverage Δ
database.go	69.65% <ø> (ø)	⬆️
dataset_insert.go	78.12% <ø> (ø)	⬆️
adapters/sqlite3/sqlite3.go	100% <ø> (ø)	⬆️
adapters/postgres/postgres.go	100% <ø> (ø)	⬆️
adapters/mysql/mysql.go	100% <ø> (ø)	⬆️

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