v0.4.3

Bump apollo-codegen to the latest version 0.17.1 (#710)
Wrap optional operation variables with Input type (#711)
Add support of enum unknown values (#712)
Operation json writer (#717)
Change mapping of GraphQL Int to Long (#724)
NetworkFirstFetcher fix to return network exception if cache fetch fails (#725)
Inline fragments as polymorphic type (#735)
SQL cache performance (#737)
Remove mutation cache root key. (#745)