Fix Typescript Mismatch

Currently, there's a mismatch with `@types/jasmine` that throws the following error:
```
node_modules/@types/jasmine/index.d.ts(404,15): error TS2428: All declarations of 'Matchers' must have identical type parameters.
node_modules/jasmine-expect/jasmine-matchers.d.ts(2,13): error TS2428: All declarations of 'Matchers' must have identical type parameters.
```
this adjustment fix the Typescript definitions of the project. Refs JamieMason#62

Author: matheo

jasmine-matchers.d.ts

@@ -1,5 +1,5 @@
 declare namespace jasmine {
-  interface Matchers {
+  interface Matchers<T> {
     toBeAfter(otherDate: Date, expectationFailOutput?: any): boolean;
     toBeArray(expectationFailOutput?: any): boolean;
     toBeArrayOfBooleans(expectationFailOutput?: any): boolean;
@@ -80,4 +80,4 @@ declare namespace jasmine {
     toThrowAnyError(expectationFailOutput?: any): boolean;
     toThrowErrorOfType(type: string, expectationFailOutput?: any): boolean;
   }
-}
+}