Update annotation's description

[night556]

Update description from

/*
 * Copyright (C) 2017-2018 Alibaba Group Holding Limited
 */

to

/*
 * Copyright (C) 1999-2019 Alibaba Group Holding Limited
 */

add a testcase to file errors_test.go

[codecov-io]

Codecov Report

Merging #118 into master will increase coverage by 0.62%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #118      +/-   ##
=========================================
+ Coverage   20.17%   20.8%   +0.62%     
=========================================
  Files          45      45              
  Lines        2716    2716              
=========================================
+ Hits          548     565      +17     
+ Misses       2148    2126      -22     
- Partials       20      25       +5

Impacted Files	Coverage Δ
config/flags.go	66.9% <ø> (ø)	⬆️
cli/flag_field.go	100% <ø> (ø)	⬆️
config/legacy.go	0% <ø> (ø)	⬆️
config/configure_delete.go	0% <ø> (ø)	⬆️
openapi/flags.go	0% <ø> (ø)	⬆️
openapi/output_filter.go	0% <ø> (ø)	⬆️
openapi/library.go	0% <ø> (ø)	⬆️
cli/parser.go	66.66% <ø> (ø)	⬆️
cli/color.go	0% <ø> (ø)	⬆️
cli/completion_installer.go	0% <ø> (ø)	⬆️
... and 29 more

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