See how Boundary would look with gofumpt applied (#853)

* See how Boundary would look with https://github.com/mvdan/gofumpt applied

Results of running `gofumpt -w -s .`

* Update tools file and Makefile for gofumpt

Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>

internal/errors/code_test.go

@@ -128,7 +128,6 @@ func TestCode_Both_String_Info(t *testing.T) {
 			assert := assert.New(t)
 			assert.Equal(errorCodeInfo[tt.want], tt.c.Info())
 			assert.Equal(errorCodeInfo[tt.want].Message, tt.c.String())
-
 		})
 	}
 }