add a method to set the indentJsonIndentString used in Context.Indent…

[bestgopher]

…edJSON

• With pull requests:
  • Open your pull request against master
  • Your pull request should have no more than two commits, if not you should squash them.
  • It should pass all tests in the available continuous integration systems such as TravisCI.
  • You should add/modify tests to cover your proposed code changes.
  • If your pull request contains a new feature, please docuHi, I have add a method named IndentJsonIndentSpaceNum for Engine to set number of indented blanks when you use Context.IndentedJSON.We can use it like this:

router := gin.Default()
router.IndentJsonIndentSpaceNum(2)

The serialized string of gin.H {" name ":" test "," age ": 2} is like:

{
  "name":  "test",
  "age": 2
}

There are only 2 spaces in front of the name field.ment it on the README.

[codecov]

Codecov Report

Merging #2349 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2349   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files          41       41           
  Lines        2305     2309    +4     
=======================================
+ Hits         2270     2274    +4     
  Misses         20       20           
  Partials       15       15           

Impacted Files	Coverage Δ
context.go	98.08% <100.00%> (ø)
gin.go	99.15% <100.00%> (+0.01%)	⬆️
render/json.go	87.80% <100.00%> (ø)

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[appleboy]

conflicts

[bestgopher]

conflicts

Where is the conflict?

[bestgopher]

@appleboy fixed conflicts