Update CHANGELOG.md

Author: jswrenn

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Added
 - Documented iteration order guarantee for `Itertools::[tuple_]combinations` (#822)
-- Documented possible panic in `Itertools::iterate` (#842)
+- Documented possible panic in `iterate` (#842)
 - Implemented `Clone` and `Debug` for `Diff` (#845)
 - Implemented `Debug` for `WithPosition` (#859)
 - Implemented `Eq` for `MinMaxResult` (#838)
@@ -29,6 +29,14 @@
 - Specialized `TakeWhileInclusive::fold` (#851)
 - Specialized `ZipLongest::rfold` (#848)
 
+### Notable Internal Changes
+- Added test coverage in CI (#847, #856)
+- Added semver check in CI (#784)
+- Enforced `clippy` in CI (#740)
+- Enforced `rustdoc` in CI (#840)
+- Improved specialization tests (#807)
+- More specialization benchmarks (#806)
+
 ## 0.12.0
 
 ### Breaking