Merge pull request #443 from smowton/smowton/admin/missing-change-notes-2021-01

Add change-notes for recent PRs that were missing them

change-notes/2020-11-03-underscore-assigns.md

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+lgtm,codescanning
+* Fixed a bug that meant partially-ignored parallel assignments, such as `x, _ := a, b`, could produce an incorrect control-flow graph.

change-notes/2020-11-19-dataflow-edges.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Fixed a bug that meant data-flow through a checked typecast (e.g. `cast, ok = x.(*Type)`) could be missed.

change-notes/2020-11-27-guarding-functions.md

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+lgtm,codescanning
+* Improved ability to recognise a sanitizing function (for example, `func f(s string) bool { return isClean(s) }`). This may reduce false-positives for any query employing a sanitizing test.

change-notes/2020-12-01-fmt-errorf.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Recognised function `fmt.Errorf` to always return non-nil strings. This may reduce false-positives that depend on a function possibly returning nil.

change-notes/2020-12-23-regexp-anchors.md

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+lgtm,codescanning
+* Query `go/regex/missing-regexp-anchor` now recognizes the start- and end-of-text anchors `\A` and `\z`. This reduces false-positives relating to unanchored expressions.