Add invalid abstract property test

[wjhurley]

This pull request makes the following changes:

• Adds an invalid test for TSAbstractPropertyDefinition to coincide with the valid test added in 30bd9ef.
• Adds a missing space in the above-mentioned valid test from 30bd9ef.
• Updates the package version in package-lock.json. This was an automatic change from npm when I ran npm install. This most likely should have been done as part of the last release.

I ran npm test to confirm that this new test works as intended. Here is a snippet from running npm test to show it passes:

      √ class { abstract a(); readonly b; } (3 ms)
      √ abstract class Foo<T> { public readonly bar: string; protected constructor(bar: string) {} protected abstract readonly _foo: T; public abstract get data(): Foo<T>['_foo']; protected abstract parse(baz?: string): T; protected abstract stringify(): string; } (11 ms)