all: sync with master; upd chlog

.github/PULL_REQUEST_TEMPLATE

@@ -0,0 +1,20 @@
+Before submitting a PR please make sure that:
+
+1.  You have discussed your solution in an issue and have got an
+    approval from a maintainer.
+
+2.  This isn't a localization fix; please send those to our
+    [CrowdIn](https://crowdin.com/project/adguard-applications/en#/adguard-home)
+    page.
+
+3.  Your code follows our
+    [code guidelines](https://github.com/AdguardTeam/CodeGuidelines/blob/master/Go/Go.md).
+
+Add a short description here.  The description should include:
+
+1.  Which issue this PR closes (`Closes #NNNN.`) or updates (`Updates
+    #NNNN.`).
+
+2.  A short description of how the change achieves that.
+
+Do not forget to remove these instructions.