Replace compilers flag with require

vially · vially · commit e468e1661720 · 2020-05-09T16:25:39.000+02:00
The mocha `--compilers` flag is deprecated in favor of `--require`: https://github.com/mochajs/mocha/wiki/compilers-deprecation
diff --git a/spec/mocha.opts b/spec/mocha.opts
@@ -1,2 +1,2 @@
---compilers ts:ts-node/register
-spec/**/*-spec.ts
+--require ts-node/register
+spec/**/*-spec.ts
