Update CMake version requirement to 3.11+

FetchContent requires CMake 3.11+, but project was configured for 3.10+.
Updated CMakeLists.txt, readme.md, and CI workflows to use CMake 3.11+.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: verri

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Setup CMake
       uses: jwlawson/actions-setup-cmake@v2
       with:
-        cmake-version: '3.10'
+        cmake-version: '3.11'
 
     - name: Configure CMake
       run: |

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Setup CMake
       uses: jwlawson/actions-setup-cmake@v2
       with:
-        cmake-version: '3.10'
+        cmake-version: '3.11'
 
     - name: Test all C++ standards
       run: |
@@ -67,6 +67,6 @@ jobs:
           ## Compatibility
           - Supports C++11 through C++23
           - Header-only library
-          - Requires CMake 3.10+
+          - Requires CMake 3.11+
         draft: false
         prerelease: false

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.11)
 project(Cool VERSION 1.0.0)
 
 configure_file("include/cool/version.hpp.in" "include/cool/version.hpp")

readme.md

@@ -61,7 +61,7 @@ $ git clone https://github.com/verri/cool.git
 $ cd cool
 ```
 
-Install via CMake 3.10+.
+Install via CMake 3.11+.
 ```
 $ cmake -S. -Bbuild
 $ cmake --build build
@@ -74,7 +74,7 @@ $ cmake --install build
 Some headers, however, use threads, e.g. `channel` and `thread_pool`.
 Thus, you will probably need to link a thread library as well.
 
-## Recommended: CMake 3.10+
+## Recommended: CMake 3.11+
 
 If you installed the library as a submodule, include the following line in your `CMakeLists.txt`
 ```