More tests on ReadJSON/WriteJSON (issues with go11)

[fredbi]

added test to assert ReadJSON/WriteJSON works

Tests

• refers to go-swagger/go-swagger#2350: this asserts on go1.11.x and go1.11.5

NOTE: the go1.11.x series may be removed later.

Dependencies

• updated dependencies
• removed requirement on go1.13, which is not justified by any code change

Linting

• re-enacted linting in CI (golangci no more operates as a CI hook)
• updated linter config and worked around a few linting issues

CI build

• rolled over go versions
• configured the "ppc" arch to generate only one single job in the expanded matrix
• run simple test with go1.11 (removed install dependencies, which no more support go1.11)

Signed-off-by: Frederic BIDON fredbi@yahoo.com

[codecov[bot]]

Codecov Report

Merging #49 (7a1a23a) into master (d88c1d0) will increase coverage by 0.66%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   88.32%   88.98%   +0.66%     
==========================================
  Files          12       12              
  Lines         899      899              
==========================================
+ Hits          794      800       +6     
+ Misses         81       75       -6     
  Partials       24       24              

Impacted Files	Coverage Δ
util.go	99.41% <ø> (ø)
loading.go	66.66% <100.00%> (ø)
json.go	63.49% <0.00%> (+4.76%)	:arrow_up:

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