removed deprecated mocha function useColors

Author: Arvid Paeglit

src/test/suite/index.ts

@@ -7,8 +7,7 @@ export function run(): Promise<void> {
     const mocha = new Mocha({
         ui: 'tdd',
     });
-    mocha.useColors(true);
-
+    
     const testsRoot = path.resolve(__dirname, '..');
 
     return new Promise((c, e) => {