v1.7.8

Changelog

00a256c Remove unnecessary check (#1073)
4f32ae6 chore: drop support go 1.13 (#1069)
f631188 chore: improve code quality (#1086)
9766b4c chore: fix broken go.mod (#1090)
557e1c6 chore: release 1.7.7 (#1087)
75e9d01 chore: remove duplicate walk func (#1070)
9d81576 feat: add separate x-enum-varnames tag (#1083)
a7065ad feat: support global type overrides (#1059)
231fa42 fix: allways init response header map at first. (#1066)
54c9ff9 fix: assignment to entry in nil map with @Header all #1082 (#1085)
d333316 fix: documentation fix formatter link (#1079)
47d0cd2 fix: parsing panics on default response (#1068)