feat: replace glide with go modules

[sevennt]

#8

[sevennt]

make build success, make test fail.

logs from travis-CI:

----------------------------------------------------------------------
FAIL: terror_test.go:109: testTErrorSuite.TestTraceAndLocation
terror_test.go:114:
    c.Assert(len(lines), Equals, 23)
... obtained int = 21
... expected int = 23
OOPS: 4 passed, 1 FAILED
--- FAIL: TestT (0.01s)
FAIL
coverage: 75.9% of statements
FAIL	github.com/XiaoMi/Gaea/parser/terror	0.012s

[niubell]

the unit tests is failed, maybe it's caused by version of "github.com/pingcap/errors", you can check it.

[sevennt]

@cx3ptr maybe we can change or delete this test case?

when github.com/pingcap/errors updated, the expected error stack lines is changed. error stack lines may not be a fixed number.

// parser/terror/terror_test.go#L113
func (s *testTErrorSuite) TestTraceAndLocation(c *C) {
	defer testleak.AfterTest(c)()
	err := example()
	stack := errors.ErrorStack(err)
	lines := strings.Split(stack, "\n")
	c.Assert(len(lines), Equals, 23)  // we asserts error stack lines count as 23, 23 may be changed in future.
	var containTerr bool
	for _, v := range lines {
		if strings.Contains(v, "terror_test.go") {
			containTerr = true
			break
		}
	}
	c.Assert(containTerr, IsTrue)
}

[teckick]

lgtm

[niubell]

after change glide to go mod, the quick start docs shoud be update together
@sevennt

[sevennt]

@cx3ptr already updated.

[niubell]

lgtm