use main instead of master in readme

azure-pipelines.yml

@@ -6,10 +6,8 @@
 trigger:
   branches:
     include:
-    - master
-    - dev3
-    - dev2
-    - dev
+    - main
+    - dev*
   tags:
     include:
     - v*
@@ -184,35 +182,6 @@ jobs:
 # Other OS versions (just debug mode)
 # ----------------------------------------------------------
 
-- job:
-  displayName: Windows 2019
-  pool:
-    vmImage:
-      windows-2019
-  strategy:
-    matrix:
-      Debug:
-        BuildType: debug
-        cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
-        MSBuildConfiguration: Debug
-      Release:
-        BuildType: release
-        cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Release
-        MSBuildConfiguration: Release
-  steps:
-  - task: CMake@1
-    inputs:
-      workingDirectory: $(BuildType)
-      cmakeArgs: .. $(cmakeExtraArgs)
-  - task: MSBuild@1
-    inputs:
-      solution: $(BuildType)/libmimalloc.sln
-      configuration: '$(MSBuildConfiguration)'
-      msbuildArguments: -m
-  - script: ctest --verbose --timeout 240 -C $(MSBuildConfiguration)
-    workingDirectory: $(BuildType)
-    displayName: CTest
-
 - job:
   displayName: Ubuntu 24.04
   pool: