Fix a wrong error message for bitwise OR

[minamijoyo]

Fixes #376

before

$ echo 'foo = a | b' | go run ./cmd/hclfmt/main.go -check
Error: Unsupported operator

  on <stdin> line 1:
   1: foo = a | b

Bitwise operators are not supported. Did you mean boolean OR ("&&")?

Error: Missing newline after argument

  on <stdin> line 1:
   1: foo = a | b

An argument definition must end with a newline.

one or more files contained errors
exit status 1

after

$ echo 'foo = a | b' | go run ./cmd/hclfmt/main.go -check
Error: Unsupported operator

  on <stdin> line 1:
   1: foo = a | b

Bitwise operators are not supported. Did you mean boolean OR ("||")?

Error: Missing newline after argument

  on <stdin> line 1:
   1: foo = a | b

An argument definition must end with a newline.

one or more files contained errors
exit status 1

[azr]

Nice, LGTM

[alisdair]

Thanks for fixing this! I'm merging now and it will go out with the next release. Sorry for the delay.

[minamijoyo]

Thanks 😄