use directories for structure

node_modules/acorn-bigint/CHANGELOG.md

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+## 0.4.0 (2019-04-04)
+
+* Make compatible with acorn-numeric-separator
+
+## 0.3.1 (2018-10-06)
+
+* Fix creation of BigInt values everywhere (Thanks, Gus Caplan!)
+
+## 0.3.0 (2018-09-14)
+
+* Update to new acorn 6 interface
+* Actually support creating BigInt values in AST in Chrome
+* Change license to MIT
+
+## 0.2.0 (2017-12-20)
+
+* Emit BigInt values in AST if supported by runtime engine
+
+## 0.1.0 (2017-12-19)
+
+Initial release