Added Github Action that closes issue if it was created for TG macOS.

.github/workflows/issue_closer.yml

@@ -0,0 +1,103 @@
+name: Issue closer.
+
+on:
+  issues:
+    types: opened
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get the latest version.
+        run: |
+          tag=$(git ls-remote --tags git://github.com/$GITHUB_REPOSITORY | cut -f 2 | tail -n1)
+          echo $tag
+          echo ::set-env name=LATEST_TAG::$tag
+
+      - name: Check a version from an issue.
+        uses: actions/github-script@0.4.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            let errorStr = "Version not found.";
+
+            let item1 = "Version of Telegram Desktop";
+            let item2 = "Used theme";
+            let body = context.payload.issue.body;
+
+            console.log("Body of issue:\n" + body);
+            let index1 = body.indexOf(item1) + item1.length;
+            let index2 = body.indexOf(item2);
+            index2 = (index2 == -1) ? Number.MAX_SAFE_INTEGER : index2;
+
+            console.log("Index 1: " + index1);
+            console.log("Index 2: " + index2);
+
+            if (index1 == -1) {
+              console.log(errorStr);
+              return;
+            }
+
+            function parseVersion(str) {
+              let pattern = /[0-9]\.[0-9][0-9.]{0,}/g;
+              return str.match(pattern);
+            }
+            function firstNum(version) {
+              return version[0].split(".")[0];
+            }
+
+            let issueVer = parseVersion(body.substring(index1, index2));
+
+            if (issueVer == undefined) {
+              console.log(errorStr);
+              return;
+            }
+            console.log("Version from issue: " + issueVer[0]);
+
+            let latestVer = parseVersion(process.env.LATEST_TAG);
+
+            if (latestVer == undefined) {
+              console.log(errorStr);
+              return;
+            }
+            console.log("Version from tags: " + latestVer[0]);
+
+            let issueNum = firstNum(issueVer);
+            let latestNum = firstNum(latestVer);
+
+            if (issueNum <= latestNum && issueNum < 5) {
+              console.log("Seems the version of this issue is fine!");
+              return;
+            }
+
+            let message = `
+            Sorry, but according to the version you specify in this issue, \
+            you are using the [Telegram for macOS](https://macos.telegram.org), \
+            not the [Telegram Desktop](https://desktop.telegram.org).
+            You can report your issue to [the group](https://t.me/macswift) \
+            or to [the repository of Telegram for macOS](https://github.com/overtake/TelegramSwift).
+
+            If I made a mistake and closed your issue wrongly, please reopen it. Thanks!
+            `;
+
+            let params = {
+              owner: context.issue.owner,
+              repo: context.issue.repo,
+              issue_number: context.issue.number
+            };
+
+            github.issues.createComment({
+              ...params,
+              body: message
+            });
+
+            github.issues.addLabels({
+              ...params,
+              labels: ['TG macOS Swift']
+            });
+
+            github.issues.update({
+              ...params,
+              state: 'closed'
+            });
+