update tests to match pre-release constraint rules

plugin/discovery/version_set_test.go

@@ -30,11 +30,21 @@ func TestVersionSet(t *testing.T) {
 		{
 			">=1.0.0",
 			"1.1.0-beta1",
+			false,
+		},
+		{
+			">=1.0.0",
+			"1.1.0",
+			true,
+		},
+		{
+			"~>1.1.0-a",
+			"1.1.0-beta1",
 			true,
 		},
 		{
 			"~>1.1.0",
-			"1.1.2-beta1",
+			"1.1.2",
 			true,
 		},
 		{