Exclude Jest config.ts files from coverage (#340)

Author: 72636c

.changeset/swift-ads-arrive.md

@@ -0,0 +1,5 @@
+---
+'skuba': patch
+---
+
+**test:** Exclude Jest `config.ts` files from coverage

jest-preset.js

@@ -32,6 +32,7 @@ module.exports = {
     '!<rootDir>/dist*/**',
     '!<rootDir>/lib*/**',
     '!<rootDir>/tmp*/**',
+    '!<rootDir>/jest.*.ts',
   ],
   coverageDirectory: 'coverage',
   moduleNameMapper: {