fix git error handling

still pretty ugly but seems like sometimes you get lowercase "not a git repository",
perhaps just an older versions

git/git.go

@@ -101,12 +101,14 @@ func output(cmd *exec.Cmd) ([]byte, error) {
 		return nil, e
 	}
 
+	out = bytes.ToLower(out)
+
 	switch {
-	case bytes.Contains(out, []byte("Not a git repository")):
+	case bytes.Contains(out, []byte("not a git repository")):
 		return nil, ErrNoRepo
-	case bytes.Contains(out, []byte("ambiguous argument 'HEAD'")):
+	case bytes.Contains(out, []byte("ambiguous argument 'head'")):
 		return nil, ErrNoRepo
-	case bytes.Contains(out, []byte("DIRTY")):
+	case bytes.Contains(out, []byte("dirty")):
 		return nil, ErrDirty
 	case err != nil:
 		return nil, errors.New(string(out))

go.mod

@@ -0,0 +1,16 @@
+module github.com/tj/go
+
+go 1.12
+
+require (
+	github.com/apex/log v1.3.0
+	github.com/atotto/clipboard v0.1.2
+	github.com/aws/aws-sdk-go v1.31.9
+	github.com/buger/goterm v0.0.0-20181115115552-c206103e1f37
+	github.com/mattn/go-isatty v0.0.9
+	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
+	github.com/pkg/errors v0.9.1
+	github.com/stripe/stripe-go v70.15.0+incompatible
+	github.com/tj/assert v0.0.1
+	gopkg.in/yaml.v3 v3.0.0-20200602174320-3e3e88ca92fa // indirect
+)

go.sum

@@ -0,0 +1,100 @@
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