fix idx error message (go-playground#54)

Update README.md

Fix out-of-range exception (go-playground#46)

Fixed out-of-range exception.

Fixes go-playground#45

update deps (go-playground#44)

update README (go-playground#43)

Merge pull request go-playground#40 from go-playground/fix-slice-idx-…

…issue

Fix slice idx issue

Merge pull request go-playground#35 from go-playground/fix-encoder-po…

…inter-omitempty

Fix Encoder Pointer + omitempty combination

Correct bug in array index logic

fixes go-playground#33

Merge pull request go-playground#32 from go-playground/fix-array-hand…

…ling

Fix Array Handling + mixed index and non-index values

Merge pull request go-playground#26 from go-playground/interface-support

Add setting of tring to interface{} values