Don't bundle acorn dependencies

package.json

@@ -53,9 +53,6 @@
   },
   "homepage": "https://github.com/Rich-Harris/buble#README",
   "devDependencies": {
-    "acorn": "^6.0.4",
-    "acorn-dynamic-import": "^4.0.0",
-    "acorn-jsx": "^5.0.0",
     "console-group": "^0.3.3",
     "eslint": "^4.19.1",
     "glob": "^7.1.3",
@@ -72,6 +69,9 @@
     "test262-stream": "^1.2.0"
   },
   "dependencies": {
+    "acorn": "^6.0.4",
+    "acorn-dynamic-import": "^4.0.0",
+    "acorn-jsx": "^5.0.1",
     "chalk": "^2.4.1",
     "magic-string": "^0.25.1",
     "minimist": "^1.2.0",

rollup.create-config.js

@@ -9,7 +9,7 @@ const ensureArray = maybeArr => Array.isArray(maybeArr) ? maybeArr : [maybeArr];
 const createConfig = (opts) => {
 	opts = opts || {};
 	const browser = opts.browser || false;
-	const external = opts.external || Object.keys(pkg.dependencies || {}).filter(dep => !dep.match(/^acorn/));
+	const external = opts.external || Object.keys(pkg.dependencies || {});
 	const output = ensureArray(opts.output);
 
 	return {
@@ -26,8 +26,8 @@ const createConfig = (opts) => {
 				target: !browser ? { node: 4 } : null,
 				include: [
 					'src/**',
-					'node_modules/acorn-jsx/**',
 					// For unpkg build
+					'node_modules/acorn-jsx/**',
 					'node_modules/regexpu-core/**',
 					'node_modules/unicode-match-property-ecmascript/**',
 					'node_modules/unicode-match-property-value-ecmascript/**',