PR template update.
-**What is fixed**
+**What is fixed** Add link to the issue this PR fixes.
-Add link to the issue this PR fixes.
+Example: Fixes #42.
-Fixes #42.
+**Why is this change proposed** If this change does *not* fix an open issue, briefly describe the rationale for this PR.
-**Why is this change proposed**
-
-If this change does *not* fix an open issue, briefly describe the rationale for this PR.
-
-**What is changed**
-
-Briefly describe the changes proposed in this pull request:
+**What is changed** Briefly describe the changes proposed in this pull request:
* Fixed rare exception happening in `x >= 42` case
* Small optimization of `decompress()` method
