Test with boost 1.84

Update unittest build job to test with currently latest boost version

.github/workflows/unittest.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        boost_version: ["1.80.0", "1.81.0", "1.82.0", "1.83.0"]
+        boost_version: ["1.81.0", "1.82.0", "1.83.0", "1.84.0"]
         os: [windows-2019, windows-2022]
         toolset: [v142, v143, ClangCL]
         build_type: [Debug, Release]
@@ -27,22 +27,22 @@ jobs:
           - { os: windows-2022, generator: "Visual Studio 16 2019" }
           - { toolset: ClangCL, build_type: Release }
         include:
-          - boost_version: "1.83.0"
+          - boost_version: "1.84.0"
             os: windows-2022
             toolset: v143
             build_type: Debug
             generator: "Visual Studio 17 2022"
             config_args: ""
             build_args: "-- -p:CharacterSet=Unicode"
             name_args: "Unicode"
-          - boost_version: "1.83.0"
+          - boost_version: "1.84.0"
             os: windows-2022
             toolset: v143
             build_type: Debug
             generator: "Visual Studio 17 2022"
             config_args: "-A Win32 -DENABLE_TESTING:BOOL=OFF"
             name_args: "32 bit"
-          - boost_version: "1.83.0"
+          - boost_version: "1.84.0"
             os: windows-2022
             toolset: ""
             build_type: ""

README.md

@@ -44,7 +44,7 @@ Code using this library must target at least
 
 Either [Asio](https://think-async.com/Asio/) or the [Boost
 libraries](https://www.boost.org) are required. Currently tested with
-Boost 1.80 to 1.83 and Asio 1.28 to 1.29 but at least most newer
+Boost 1.81 to 1.84 and Asio 1.28 to 1.29 but at least most newer
 versions ought to work.
 
 A working C++ compiler supporting at least the C++14 standard is