Set minimum Clang version to 3.8 (#1820)

.github/workflows/ci.yml

@@ -78,12 +78,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - clang: "3.5"
-            cxxflags: "-stdlib=libc++"
-          - clang: "3.6"
-            cxxflags: "-stdlib=libc++"
-          - clang: "3.7"
-            cxxflags: "-stdlib=libc++"
           - clang: "3.8"
             cxxflags: "-stdlib=libc++"
           - clang: "3.9"
@@ -102,8 +96,6 @@ jobs:
     steps:
       - name: Install
         run: |
-          sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ trusty main'
-          sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ trusty universe'
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ xenial main'
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ xenial universe'
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ bionic main'

README.md

@@ -85,7 +85,7 @@ ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
     * Continuously tested on
         * [Visual Studio 2017, 2019, 2022](https://ci.appveyor.com/project/bblanchon/arduinojson/branch/6.x)
         * [GCC 6, 7, 8, 9, 10, 11](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22)
-        * [Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 6.0, 7, 8, 9, 10](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22)
+        * [Clang 3.8, 3.9, 4.0, 5.0, 6.0, 7, 8, 9, 10](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22)
     * [Continuously fuzzed with Google OSS Fuzz](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:arduinojson)
     * Passes all default checks of [clang-tidy](https://releases.llvm.org/10.0.0/tools/clang/tools/extra/docs/clang-tidy/)
 * Well documented