change type of directive func & add err extension

v0.0.9

change type of directive func & add err extension

custom improvement

- add directive implementation
- match Int input args type with int and int64
- move trace field so can capture recover if panic
- [tracer] add tag response data
- subscription: add panic handling
- panic handling: add extension
- subscription: check all fields until find method
- exec subscription field: add todo
- subscription: method resolver not only in root
- separate query, mutation, subscription resolver

resolver: add stringer in scalar String type

v0.0.7

resolver: add stringer in scalar String type

match Int input args type with int and int64

v0.0.6

match Int input args type with int and int64

move trace field so can capture recover if panic

v0.0.5

move trace field so can capture recover if panic

[tracer] add tag response data

v0.0.4

[tracer] add tag response data

improve panic handling

v0.0.3

subscription: add panic handling

Subscription: check all fields until find method

v0.0.2

subscription: check all fields until find method

Improve subscription and Int scalar type

v0.0.1

update import to local path