Add sinon package for mocking

node_modules/@sinonjs/formatio/CHANGES.md

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+# Changes
+
+## 5.0.1
+
+- [`47a360d`](https://github.com/sinonjs/formatio/commit/47a360d5c5db72ba8ced2d598421bfe105facc69)
+  Bump @sinonjs/samsam to latest (Morgan Roderick)
+    >
+    > This helps dedupe dependencies in Sinon. See https://github.com/sinonjs/sinon/issues/2224
+    >
+
+_Released on 2020-02-20._
+
+## 5.0.0
+
+- [`116aedb`](https://github.com/sinonjs/formatio/commit/116aedb20ca89f5f022633457366afe17b070772)
+  Drop support for Node 8 (Morgan Roderick)
+    >
+    > As can be seen at https://github.com/nodejs/Release, Node 8 reached
+    > "end" of life on 2019-12-31, and is no longer actively supported.
+    >
+    > We will stop testing in Node 8 and start testing in Node 13, which will
+    > become the next LTS release from April 2020.
+    >
+
+_Released on 2020-02-19._
+
+## 4.0.1
+
+- [`8dae99e`](https://github.com/sinonjs/formatio/commit/8dae99e19fb1f63707669aa18375aac377de92be)
+  Fix changes.md (Morgan Roderick)
+- [`8dde8cb`](https://github.com/sinonjs/formatio/commit/8dde8cb370a2ea54f8d46ff43d1bf69a6ce661c5)
+  Use '--access public' for the publish command (Morgan Roderick)
+
+_Released on 2019-12-19._
+
+## 4.0.0
+
+- [`8693846`](https://github.com/sinonjs/formatio/commit/869384686588e4c71612ce99e4b840842a0e5a46)
+  add support for formatting maps (#51) (Marc Redemske)
+    > * add support for formatting maps
+    > * Update @sinonjs/samsam to version that has isMap method
+
+_Released on 2019-12-19._