fix(package): reduce changelog issues to 300 [ci skip]

Author: levithomason

package.json

@@ -23,7 +23,7 @@
     "build:umd": "cross-env NODE_ENV=build gulp umd",
     "build:docs-toc": "doctoc ./.github/CONTRIBUTING.md --github --maxlevel 4",
     "build:docs-cname": "echo react.semantic-ui.com > docs/build/CNAME",
-    "build:changelog": "github_changelog_generator --no-issues --no-unreleased --release-branch master --since-tag $(git describe --abbrev=0 --tags $(git rev-parse HEAD~400))",
+    "build:changelog": "github_changelog_generator --no-issues --no-unreleased --release-branch master --since-tag $(git describe --abbrev=0 --tags $(git rev-parse HEAD~300))",
     "deploy:changelog": "git add CHANGELOG.md && git commit -m 'docs(changelog): update changelog [ci skip]' && git push",
     "predeploy:docs": "cross-env NODE_ENV=production yarn build:docs && yarn build:docs-cname",
     "deploy:docs": "gh-pages -d docs/build -m 'deploy docs [ci skip]'",