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, 20 insertions, 0 deletions

diff --git a/packages/json-schemas/schemas/block_range_schema.ts b/packages/json-schemas/schemas/block_range_schema.ts
new file mode 100644
index 000000000..1f6a63151
--- /dev/null
+++ b/packages/json-schemas/schemas/block_range_schema.ts
@@ -0,0 +1,20 @@
+export const blockParamSchema = {
+    id: '/BlockParam',
+    oneOf: [
+        {
+            type: 'number',
+        },
+        {
+            enum: ['latest', 'earliest', 'pending'],
+        },
+    ],
+};
+
+export const blockRangeSchema = {
+    id: '/BlockRange',
+    properties: {
+        fromBlock: { $ref: '/BlockParam' },
+        toBlock: { $ref: '/BlockParam' },
+    },
+    type: 'object',
+};