Merge pull request #64 from hao-feng/master

 update demo to swift 5.0. remove ObjC InitializerHelper

version 0.10.3

Merge pull request #50 from hao-feng/dev

fix placeholder bug

Merge pull request #45 from lincode/dev

Fix placeholder search and insert

Merge pull request #43 from hao-feng/master

change intent result to dictionary

Merge pull request #40 from lincode/dev

add two discardableResult comment

Merge pull request #30 from lincode/check_intent

Add validation of intent

Merge pull request #21 from lincode/dev

Update podspec