fix: don't require additional params type param

Fixes a type regression introduced in #6

package.json

@@ -43,23 +43,23 @@
   "devDependencies": {
     "@semantic-release/condition-codeship": "^1.1.0",
     "@semantic-release/release-notes-generator": "^7.1.4",
-    "@types/jest": "^24.0.4",
-    "@types/node": "^11.9.3",
+    "@types/jest": "^24.0.13",
+    "@types/node": "^12.0.2",
     "@types/rimraf": "^2.0.2",
-    "coveralls": "^3.0.2",
-    "husky": "^1.3.1",
-    "jest": "^24.1.0",
-    "lint-staged": "^8.1.4",
-    "prettier": "^1.16.4",
+    "coveralls": "^3.0.3",
+    "husky": "^2.3.0",
+    "jest": "^24.8.0",
+    "lint-staged": "^8.1.7",
+    "prettier": "^1.17.1",
     "rimraf": "^2.6.3",
-    "semantic-release": "^15.13.3",
+    "semantic-release": "^15.13.12",
     "semantic-release-conventional-commits": "^2.0.1",
     "smid": "^0.1.1",
-    "ts-jest": "^23.10.5",
-    "tslint": "^5.12.1",
+    "ts-jest": "^24.0.2",
+    "tslint": "^5.16.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-config-standard": "^8.0.1",
-    "typescript": "^3.3.3"
+    "typescript": "^3.4.5"
   },
   "prettier": {
     "semi": false,

src/__tests__/make-error-class.test.ts

@@ -29,7 +29,7 @@ describe('MakeErrorClass', () => {
   })
 
   describe('assert', () => {
-    class Test extends MakeErrorClass('This is a test', { statusCode: 400 }) {}
+    class Test extends MakeErrorClass('This is a test') {}
 
     it('throws the correct error', () => {
       const err = throws<Test>(() => Test.assert(false, 'Oh no'))
@@ -146,7 +146,7 @@ describe('MakeErrorClass', () => {
   })
 })
 
-describe('ignore', async () => {
+describe('ignore', () => {
   class IgnorePlz extends MakeErrorClass('Ignore plz') {}
 
   test('works', async () => {

src/make-error-class.ts

@@ -133,14 +133,14 @@ export interface BaseErrorConstructor<A> {
   /**
    * Makes an asserter function.
    */
-  makeAssert<T, A>(
+  makeAssert<T>(
     message: string,
     attrs?: Partial<ErrorAttributes<A>>
   ): Asserter<T>
   /**
    * Asserts the truthiness of the given value, throws the error otherwise.
    */
-  assert<T, A>(
+  assert<T>(
     data: T,
     message?: string,
     attrs?: Partial<ErrorAttributes<A>>