maintenance 2021-05-17

[dasrick]

• update dependencies
• add go version to travis
• add upgrade command to makefile

[codecov-commenter]

Codecov Report

Merging #2 (70684e9) into master (acd2af0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           24        16    -8     
=========================================
- Hits            24        16    -8     

Impacted Files	Coverage Δ
string.go	100.00% <0.00%> (ø)
validate.go	100.00% <0.00%> (ø)
jsonunmarshal.go	100.00% <0.00%> (ø)

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