Fix CI for release0.6 (#304)

* We need at least CMake 3.15 for dpctl-capi. (#299)
  * Do not use POP_FRONT in FindDPCPP.cmake so that we can use a cmake version older that 3.15.
* Run GitHub Actions for all PRs
* Update CHANGELOG

Author: PokhodenkoSA

.github/workflows/black.yml

@@ -5,9 +5,8 @@ name: black
 # Controls when the action will run. Triggers the workflow on push or pull request
 # events but only for the master branch
 on:
-  push:
-    branches: [master]
   pull_request:
+  push:
     branches: [master]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel

.github/workflows/clang-format.yml

@@ -5,9 +5,8 @@ name: clang-format Check
 # Controls when the action will run. Triggers the workflow on push or pull request
 # events but only for the master branch
 on:
-  push:
-    branches: [master]
   pull_request:
+  push:
     branches: [master]
 
 jobs:

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.6.1] - 2021-03-01
+### Fixed
+- Do not use POP_FRONT in FindDPCPP.cmake so that we can use a cmake version older that 3.15.
+
 ## [0.6.0] - 2021-03-01
 ### Added
 - Documentation improvements.