Commits on May 18, 2020

1. feat(typescript-estree): handle 3.9's non-null assertion changes …

   [TS 3.9 introduced a breaking change for how non-null assertions are handled in optional chains](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-9.html#parsing-differences-in-optional-chaining-and-non-null-assertions).
   
   Pre-3.9,  `x?.y!.z` means `(x?.y).z` - i.e. it essentially scrubbed the optionality from the chain
   Post-3.9, `x?.y!.z` means `x?.y!.z`  - i.e. it just asserts that the property `y` is non-null, not the result of `x?.y`
   
   This PR:
   
   **updates the AST so it matches this**
   
   Previously `x?.y!.z` produced `MemberExpression > TSNonNullAssertion > OptionalMemberExpression`.
   Now it produces `OptionalMemberExpression > TSNonNullAssertion > OptionalMemberExpression`.
   
   Note that
   `(x?.y)!.z` still produces `MemberExpression > TSNonNullAssertion > OptionalMemberExpression`.
   
   Same results apply for call expressions.
   
   **updates `no-non-null-asserted-optional-chain` to handle this**
   
   With the above AST change, the only change needed was a simple "is parent optional chain" check.
   
   Both of these changes are gated behind a version check, so they are completely backwards compatible.

   

   bradzacher committed May 18, 2020
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2. fix: test failures from 3.9 bump

   

   bradzacher committed May 18, 2020
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3. Merge branch 'master' into ts3-9-non-null-assertion-change

   

   bradzacher committed May 18, 2020
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