Add `SPDX-License-Identifier` as alised for "license" module header tokens

C.f. SPDX 2.1 - Appendix V
 https://spdx.org/spdx-specification-21-web-version#h.twlc0ztnng3b

    The tag should appear on its own line in the source file, generally as part of a comment.

    SPDX-License-Identifier: <SPDX License Expression>

Cherry-picked from #743

1 files changed, 3 insertions, 0 deletions

diff --git a/CHANGES.md b/CHANGES.md
index 38346c00..ab2ef01a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -28,6 +28,9 @@
  * Overhaul Haddock's rendering of kind signatures so that invisible kind
    parameters are not printed (#681)
 
+ * Recognise `SPDX-License-Identifier` as alias for `License` in module header
+   parser (#743)
+
 ## Changes in version 2.18.1
 
  * Synopsis is working again (#599)