Update the CHANGELOG

Merge pull request #235 from youshido-php/release/1.7.0

Update the CHANGELOG for v1.7.0

Merge pull request #221 from youshido-php/not-found-in-resolve

Return null not just when the field is scalar but whenever it's non-null

merging

fixed invalid type for input field validation

Deferred Resolvers + Fixes

Bugfixes and Updates

Updated parser & Bugfixes

Deferred Resolvers

Updated Processor
Bugfixes

**Bug Fixes:**

148 #148
144 #144
147 #147