Update zip script to include sprite SVG

package.json

@@ -23,7 +23,7 @@
     "docs-purge": "npm run docs-build && npx purgecss --css docs/static/assets/css/bootstrap.min.css --content _site/**/*.html,_site/index.html --output docs/static/assets/css/",
     "pages": "node build/build-pages.js",
     "icons": "node build/build-svgs.js",
-    "icons-zip": "cross-env-shell \"shx rm -rf bootstrap-icons-$npm_package_version && shx cp -r icons/ bootstrap-icons-$npm_package_version && zip -r9 bootstrap-icons-$npm_package_version.zip bootstrap-icons-$npm_package_version && shx rm -rf bootstrap-icons-$npm_package_version\"",
+    "icons-zip": "cross-env-shell \"shx rm -rf bootstrap-icons-$npm_package_version && shx cp -r icons/ bootstrap-icons-$npm_package_version && shx cp bootstrap-icons.svg bootstrap-icons-$npm_package_version && zip -r9 bootstrap-icons-$npm_package_version.zip bootstrap-icons-$npm_package_version && shx rm -rf bootstrap-icons-$npm_package_version\"",
     "icons-sprite": "svg-sprite --svg-namespace-classnames false --symbol --symbol-dest . --symbol-sprite bootstrap-icons.svg icons/*.svg",
     "publish": "npm-run-all icons icons-sprite docs-build icons-zip",
     "netlify": "npm-run-all icons docs-build",