Merge branch 'development' into feature/portal-ledger-support

* development: (437 commits)
  Publish
  Update yarn.lock
  Update the CHANGELOG
  Fix the bug making it impossible to specify the custom ZRX address
  Fix fill/cancel order by looking for NoError instead of empty blockchainErr given the BlockchainErrs type refactor
  Add a comment about a yarn bug
  Add our mainnet and kovan nodes as backups for Portal requests
  Fix bug hiding the user info from topBar
  Add dev-utils package to top level README
  Prettier newline
  Prettier
  Allow Token symbols to be alphanumeric
  Update CHANGELOG, rebase on development
  Should not -> cannot
  Reject negative amounts in isValidBaseUnitAmount
  Re-add changelog for 0x.js
  Fix prettier
  Update yarn.lock
  Move tests to a separate folder
  Change file layout
  ...

# Conflicts:
#	packages/website/README.md

1 files changed, 44 insertions, 6 deletions

diff --git a/packages/json-schemas/README.md b/packages/json-schemas/README.md
index d89f57a5e..9166f50c1 100644
--- a/packages/json-schemas/README.md
+++ b/packages/json-schemas/README.md
@@ -1,16 +1,16 @@
-json-schemas
-------------
+## @0xproject/json-schemas
 
 Contains 0x-related json schemas
 
-## Install:
+## Installation
 
 ```bash
-npm install @0xproject/json-schemas --save
+yarn add @0xproject/json-schemas
 ```
 
-## Usage:
-```
+## Usage
+
+```javascript
 import {SchemaValidator, ValidatorResult, schemas} from '@0xproject/json-schemas';
 
 const {orderSchema} = schemas;
@@ -22,3 +22,41 @@ const order = {
 const validatorResult: ValidatorResult = validator.validate(order, orderSchema); // Contains all errors
 const isValid: boolean = validator.isValid(order, orderSchema); // Only returns boolean
 ```
+
+## Contributing
+
+We strongly encourage that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+```bash
+yarn build
+```
+
+### Lint
+
+```bash
+yarn lint
+```
+
+### Run Tests
+
+```bash
+yarn test
+```