Add generated changelog entries

changelog/@unreleased/pr-957.v2.yml

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+type: improvement
+improvement:
+  description: |-
+    Implement Error Prone `ThrowError` to discourage throwing Errors in production code
+    Errors are often handled poorly by libraries resulting in unexpected
+    behavior and resource leaks. It's not obvious that 'catch (Exception e)'
+    does not catch Error.
+    This check  is intended to be advisory - it's fine to
+    `@SuppressWarnings("ThrowError")` in certain cases, but is usually not
+    recommended unless you are writing a testing library that throws
+    AssertionError.
+  links:
+  - https://github.com/palantir/gradle-baseline/pull/957