chore: Stop to handle undefined pluginConfig

It's not handled by semantic-release 9.0.0

Author: pvdlg

lib/index.js

@@ -26,7 +26,7 @@ const DEFAULT_RELEASE_RULES = require('./default/release-rules');
  * @param {Array} options.commits array of commits
  * @param {commitAnalyzerCallback} callback The callback called with the release type.
  */
-async function commitAnalyzer(pluginConfig = {}, {commits, logger}, callback) {
+async function commitAnalyzer(pluginConfig, {commits, logger}, callback) {
   const releaseRules = loadReleaseRules(pluginConfig);
   const config = await loadParserConfig(pluginConfig);
   let releaseType = null;

test/integration.test.js

@@ -244,10 +244,3 @@ test('Re-Throw error from "conventional-changelog-parser"', async t => {
   const commits = [{message: 'Fix: First fix (fixes #123)'}, {message: 'Update: Second feature (fixes #456)'}];
   await t.throws(promisify(commitAnalyzer)({parserOpts: {headerPattern: '\\'}}, {commits, logger: t.context.logger}));
 });
-
-test('Accept an undefined "pluginConfig"', async t => {
-  const commits = [{message: 'fix(scope1): First fix'}, {message: 'feat(scope2): Second feature'}];
-  const releaseType = await promisify(commitAnalyzer)(undefined, {commits, logger: t.context.logger});
-
-  t.is(releaseType, 'minor');
-});