dialect/sql/sqlgraph: adding unit tests for IsConstraintError (ent#1318)

* dialect/sql/sqlgraph: adding unit tests for IsConstraintError group of checks in second phase of ent#1310

* renaming test for loop variable names

* use backtick strings to improve readability

go: rename module from github.com/facebook/ent => entgo.io/ent (ent#1226

)

dialect/sql/schema: combine binary and varbinary to one clause (ent#1140

)

schema/field: add const name for type other (ent#1038)

build(deps): bump actions/setup-node from v2.1.2 to v2.1.3 (ent#1031)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v2.1.2 to v2.1.3.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v2.1.2...27082ce)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

doc: rename cmd entc to ent (ent#997)

doc: add example for adding prediactes to codegen assets

doc: update readme summary

schema/field: fix broken logic in ValueMap (ent#716)

schema/field: add the NamedValues option to the enum builder (ent#715)