Update shrinkwrap readme

[vicb]

- updating to master,
- rm node_modules/
- npm install,
- update the pkg.json for minichain as described in the readme (even though the tsd project is untouched),
- rm the 2 minichain folders (related to the previous step) - NOT mentioned in the readme

2 last steps are required even if not updating tsd

/cc @juliemr

[juliemr]

Also, the path is wrong. Right now it's
node_modules/ts2dart/node_modules/tsd/node_modules/minitable/package.json
should be
node_modules/tsd/node_modules/minitable/package.json (e.g. no longer is there a dep from ts2dart)

[vicb]

Also fs_events on Linux

[IgorMinar]

please take a look at #2092

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