Update Jest dependency in all packages to ^21

[jeskew]

No description provided.

[trivikr]

I tried to update jest in trivikr:update-jest
The test failures are documented in the commit trivikr@1ad0705

As of now, I've fixed couple of them:

• Expected value mismatch in "Unable to locate secure random source" in trivikr@cb81ff6
• Change JSON to Error Object in trivikr@0066bf4

Pending:

• ReferenceError: defaultRegion is not defined
• TypeError: Cannot read property 'byteLength' of undefined
• No file coverage available
• Your test suite must contain at least one test.

I'll find sometime next weekend to revisit fixing these tests.
If you do take a look at the commits - do comment on this issue on how to fix the remaining, or even better - push the fixes to trivikr:update-jest

[trivikr]

Closing as we updated jest to v24 in #243

[lock]

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