introduce a merge option

dist/npmts.config.d.ts

@@ -1,7 +1,14 @@
-export declare type npmtsMode = 'default' | 'custom';
+/**
+ * specifies the different modes available
+ * default -> uses default options no matterm what
+ * merge -> uses merged default + custom options
+ * custom -> only uses specified options
+ */
+export declare type npmtsMode = 'default' | 'custom' | 'merge';
 export interface INpmtsConfig {
     argv: any;
     coverageTreshold: number;
+    checkDependencies: boolean;
     mode: npmtsMode;
     test: boolean;
     testTs: any;