adapt to new package ci standards, fix test modules getting installed on non test projects

lib/snippets/node/index.ts

@@ -96,7 +96,7 @@ export default class Node implements Snippet {
     run_command (
       `yarn add --dev @sapphirecode/eslint-config${use_ts
         ? '-ts typescript @ava/typescript'
-        : ''} eslint nyc ava`,
+        : ''} eslint${use_tests ? ' nyc ava' : ''}`,
       folder
     );