Make Changelog PR numbers clickable

cc @infinisil

Author: alanz

Changelog.md

@@ -3,41 +3,41 @@
 - GHC 8.6.5 preliminary support added via the nightly build (@alanz)
 - Add `diagnosticsOnChange` config parameter, default `True`
   (preserving prior hie behaviour). Setting it `False` only generates
-  diagnostics on file save. (#1164, @mpickering/@lorenzo)
+  diagnostics on file save. ([#1164](https://github.com/haskell/haskell-ide-engine/pull/1164), @mpickering/@lorenzo)
 - The `Hsimport` plugin now formats the resulting change using the
-  formatter configured for hie. (#1167,@fendor)
+  formatter configured for hie. ([#1167](https://github.com/haskell/haskell-ide-engine/pull/1167),@fendor)
 - Actually enable type definition requests, if supported by the client
-  (e.g. vscode). (#1169/@fendor, #1172/@bubba)
-- Use LSP MarkupContent for generated documentation (#1181, @alanz)
-- remove installation of Cabal by cabal (#1184, @power-fungus)
+  (e.g. vscode). ([#1169](https://github.com/haskell/haskell-ide-engine/pull/1169)/@fendor, [#1172](https://github.com/haskell/haskell-ide-engine/pull/1172)/@bubba)
+- Use LSP MarkupContent for generated documentation ([#1181](https://github.com/haskell/haskell-ide-engine/pull/1181), @alanz)
+- remove installation of Cabal by cabal ([#1184](https://github.com/haskell/haskell-ide-engine/pull/1184), @power-fungus)
 - Add EmptyDataDecls to available pragmas, for generating code actions
-  to insert if needed. (#1187,@fendor)
+  to insert if needed. ([#1187](https://github.com/haskell/haskell-ide-engine/pull/1187),@fendor)
 - Make sure the end of formatted text is properly indicated for marked
-  up documentation (#1189, @alanz)
-- Fix some of the tests with cabal new-build (#1194, @michaelpj)
-- Update build-tool-depends for func-test (#1198, @bubba)
-- Fix version of lsp-test so `cabal new-build` works (#1211, @power-fungus)
-- Bump hlint to 2.1.17 (#1213, @alanz)
-- Use cabal helper that searches with exe extension on windows (#1217, @alanz)
+  up documentation ([#1189](https://github.com/haskell/haskell-ide-engine/pull/1189), @alanz)
+- Fix some of the tests with cabal new-build ([#1194](https://github.com/haskell/haskell-ide-engine/pull/1194), @michaelpj)
+- Update build-tool-depends for func-test ([#1198](https://github.com/haskell/haskell-ide-engine/pull/1198), @bubba)
+- Fix version of lsp-test so `cabal new-build` works ([#1211](https://github.com/haskell/haskell-ide-engine/pull/1211), @power-fungus)
+- Bump hlint to 2.1.17 ([#1213](https://github.com/haskell/haskell-ide-engine/pull/1213), @alanz)
+- Use cabal helper that searches with exe extension on windows ([#1217](https://github.com/haskell/haskell-ide-engine/pull/1217), @alanz)
 
 - Stability improvements
-  - Avoid crash in case of nonsensical hoogle db (#1174, @fendor)
-  - Prevent hie crash if apply-refact crashes (#1220, @Hogeyama)
+  - Avoid crash in case of nonsensical hoogle db ([#1174](https://github.com/haskell/haskell-ide-engine/pull/1174), @fendor)
+  - Prevent hie crash if apply-refact crashes ([#1220](https://github.com/haskell/haskell-ide-engine/pull/1220), @Hogeyama)
 
 - Documentation improvements
-  - Improve code documentation about formatters (#1165,@fendor)
-  - Add code documentation for the Hoogle plugin (#1173,@fendor)
-  - Change 'build-docs' to 'build-doc' in README (#1185, @ajeetdsouza)
-  - README Nix - replace old.postFixup -> postFixup (#1193, @backuitist)
-  - Expand documentation on the build system (#1200, @power-fungus)
-  - Fixed a typo. (#1212, @rashadg1030)
+  - Improve code documentation about formatters ([#1165](https://github.com/haskell/haskell-ide-engine/pull/1165),@fendor)
+  - Add code documentation for the Hoogle plugin ([#1173](https://github.com/haskell/haskell-ide-engine/pull/1173),@fendor)
+  - Change 'build-docs' to 'build-doc' in README ([#1185](https://github.com/haskell/haskell-ide-engine/pull/1185), @ajeetdsouza)
+  - README Nix - replace old.postFixup -> postFixup ([#1193](https://github.com/haskell/haskell-ide-engine/pull/1193), @backuitist)
+  - Expand documentation on the build system ([#1200](https://github.com/haskell/haskell-ide-engine/pull/1200), @power-fungus)
+  - Fixed a typo. ([#1212](https://github.com/haskell/haskell-ide-engine/pull/1212), @rashadg1030)
   - Add documentation about building hie with profiling
-    enabled. (#1225, @skress)
-  - Add Documentation for Pragmas Plugin (#1222, @fendor)
+    enabled. ([#1225](https://github.com/haskell/haskell-ide-engine/pull/1225), @skress)
+  - Add Documentation for Pragmas Plugin ([#1222](https://github.com/haskell/haskell-ide-engine/pull/1222), @fendor)
 
 - Build system improvements
   - Further improvements and simplification of the `./install.hs`
-    build system (#1168, @power-fungus)
+    build system ([#1168](https://github.com/haskell/haskell-ide-engine/pull/1168), @power-fungus)
 
 # 0.8.0.0