"gin mode unknown" error: show available mode

[codenoid]

Before:

panic: gin mode unknown: development

goroutine 1 [running]:
github.com/gin-gonic/gin.SetMode(...)
	/home/flatearther/go/packages/pkg/mod/github.com/gin-gonic/gin@v1.6.3/mode.go:61
github.com/gin-gonic/gin.init.0()
	/home/flatearther/go/packages/pkg/mod/github.com/gin-gonic/gin@v1.6.3/mode.go:48 +0x16a
exit status 2

After:

panic: gin mode unknown: development (available mode: debug release test)

goroutine 1 [running]:
github.com/gin-gonic/gin.SetMode(...)
	/home/flatearther/go/packages/pkg/mod/github.com/gin-gonic/gin@v1.6.3/mode.go:61
github.com/gin-gonic/gin.init.0()
	/home/flatearther/go/packages/pkg/mod/github.com/gin-gonic/gin@v1.6.3/mode.go:48 +0x16a
exit status 2

[thinkerou]

lgtm

[codecov]

Codecov Report

Merging #2567 (b2e9734) into master (4d2dad5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2567   +/-   ##
=======================================
  Coverage   98.49%   98.49%           
=======================================
  Files          41       41           
  Lines        1989     1989           
=======================================
  Hits         1959     1959           
  Misses         17       17           
  Partials       13       13           

Impacted Files	Coverage Δ
mode.go	100.00% <100.00%> (ø)

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