add changelog entry

Author: mgsium

changelog.d/issue-8189

@@ -0,0 +1,11 @@
+synopsis: Pretty-print run targets on failure
+packages: cabal-install
+prs: #8234
+issues: #8189
+
+description: {
+
+- Targets of the `run` command are pretty-printed when failing due to multiple targets. 
+- Duplicate targets are removed in the output.
+
+}