Update goreleaser config to current format

Author: horgh

Diff for: .goreleaser.yml

@@ -46,9 +46,12 @@ nfpms:
     formats:
       - 'deb'
       - 'rpm'
-    bindir: '/usr/bin'
-    files:
-      'CHANGELOG.md': '/usr/share/doc/xgb2code/CHANGELOG.md'
-      'LICENSE-APACHE': '/usr/share/doc/xgb2code/LICENSE-APACHE'
-      'LICENSE-MIT': '/usr/share/doc/xgb2code/LICENSE-MIT'
-      'README.md': '/usr/share/doc/xgb2code/README.md'
+    contents:
+      - src: CHANGELOG.md
+        dst: /usr/share/doc/xgb2code/CHANGELOG.md
+      - src: LICENSE-APACHE
+        dst: /usr/share/doc/xgb2code/LICENSE-APACHE
+      - src: LICENSE-MIT
+        dst: /usr/share/doc/xgb2code/LICENSE-MIT
+      - src: README.md
+        dst: /usr/share/doc/xgb2code/README.md