prettier conflicts with tslint

Running prettier via `yarn format` results in this diff in src/makePatch.ts
(Note: prettier needs to be run twice)
```diff
- // copy .npmrc/.yarnrc in case packages are hosted in private registry
- [".npmrc", ".yarnrc"].forEach(rcFile => {
+ // copy .npmrc/.yarnrc in case packages are hosted in private registry
+ ;[".npmrc", ".yarnrc"].forEach(rcFile => {
```
Comment is *indented* and a semi-colon is *inserted* before the tuple. This causes tslint to flag
```
ERROR: src/makePatch.ts:106:6 - statements are not aligned
```
After update prettier to 2.1.1 the *comment indentation* is fixed to
```diff
// copy .npmrc/.yarnrc in case packages are hosted in private registry
- [".npmrc", ".yarnrc"].forEach(rcFile => {
+ ;[".npmrc", ".yarnrc"].forEach((rcFile) => {
```
but the tslint error pertains. Updating tslint to 6.1.3 seems to fix it.