[Dev Deps] update eslint, @ljharb/eslint-config, covert, has,…

… `tape`

.eslintrc

@@ -9,5 +9,14 @@
 		"no-extend-native": [2, { "exceptions": ["RegExp"] }],
 		"no-invalid-regexp": [2, { "allowConstructorFlags": ["s", "u", "y"] }],
 		"no-invalid-this": 0
-	}
+	},
+
+	"overrides": [
+		{
+			"files": "test/**",
+			"rules": {
+				"max-lines-per-function": 0,
+			},
+		},
+	],
 }

package.json

@@ -37,12 +37,12 @@
 	},
 	"devDependencies": {
 		"@es-shims/api": "^2.1.2",
-		"@ljharb/eslint-config": "^12.2.1",
-		"covert": "^1.1.0",
+		"@ljharb/eslint-config": "^15.0.2",
+		"covert": "^1.1.1",
 		"eclint": "^2.8.1",
-		"eslint": "^4.9.0",
-		"has": "^1.0.1",
-		"tape": "^4.8.0"
+		"eslint": "^6.7.2",
+		"has": "^1.0.3",
+		"tape": "^4.11.0"
 	},
 	"testling": {
 		"files": "test/index.js",

polyfill.js

@@ -10,7 +10,7 @@ module.exports = function getPolyfill() {
 	if (!supportsDescriptors) {
 		throw new TypeErr('RegExp.prototype.flags requires a true ES5 environment that supports property descriptors');
 	}
-	if (/a/mig.flags === 'gim') {
+	if ((/a/mig).flags === 'gim') {
 		var descriptor = gOPD(RegExp.prototype, 'flags');
 		if (descriptor && typeof descriptor.get === 'function' && typeof (/a/).dotAll === 'boolean') {
 			return descriptor.get;