PEP 830: Add timestamps to exceptions and tracebacks (#4592)

We'll let the PEP text do the talking for itself.

Author: gpshead

.github/CODEOWNERS

@@ -703,6 +703,7 @@ peps/pep-0826.rst  @savannahostrowski
 peps/pep-0827.rst  @1st1
 peps/pep-0828.rst  @ZeroIntensity
 peps/pep-0829.rst  @warsaw
+peps/pep-0830.rst  @gpshead
 # ...
 peps/pep-2026.rst  @hugovk
 # ...