[docs] Add link to Gitter in CONTRIBUTING.md
[docs] Add link to Gitter in CONTRIBUTING.md
YOTOV-LIMITED/validator,YOTOV-LIMITED/validator,sammuelyee/validator,takenspc/validator,tripu/validator,sammuelyee/validator,YOTOV-LIMITED/validator,sammuelyee/validator,tripu/validator,sammuelyee/validator,takenspc/validator,validator/validator,YOTOV-LIMITED/validator,validator/validator,takenspc/validator,validator/validator,validator/validator,tripu/validator,takenspc/validator,sammuelyee/validator,tripu/validator,tripu/validator,validator/validator,takenspc/validator,YOTOV-LIMITED/validator