Add default project check

src/rules/dtHeaderRule.ts

@@ -34,6 +34,9 @@ function walk(ctx: Lint.WalkContext<void>): void {
         return;
     }
 
+    lookFor(
+        "// Project: https://github.com/baz/foo",
+        "Project should be a link to the project's source code repository, not the default.");
     lookFor("// Definitions by: My Self", "Author name should be your name, not the default.");
     const error = validate(text);
     if (error) {

test/dt-header/wrong/types/default-project/index.d.ts.lint

@@ -0,0 +1,5 @@
+// Type definitions for dt-header 1.0
+// Project: https://github.com/baz/foo (Does not have to be to GitHub, but prefer linking to a source code repository rather than to a project website.)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [Project should be a link to the project's source code repository, not the default. See: https://github.com/Microsoft/dtslint/blob/master/docs/dt-header.md]
+// Definitions by: Jane Doe <https://github.com/janedoe>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped