Update Mac machine to 10.15 (#58)

Author: BrennanConroy

.azure/default-build.yml

@@ -24,7 +24,7 @@ jobs:
     enableTelemetry: true
     pool:
       ${{ if eq(parameters.agentOs, 'macOS') }}:
-        vmImage: macOS-10.14
+        vmImage: macOS-10.15
       ${{ if eq(parameters.agentOs, 'Linux') }}:
         vmImage: ubuntu-16.04
       ${{ if eq(parameters.agentOs, 'Windows') }}:
@@ -40,9 +40,9 @@ jobs:
         cacheHitVar: CACHE_RESTORED
       displayName: Cache vcpkg packages
       condition: eq( '${{ parameters.useCppRestSDK }}', 'true' )
-  
+
     - ${{ parameters.beforeBuild }}
-  
+
     - task: CMake@1
       inputs:
         cmakeArgs: .. ${{ parameters.cMakeRunArgs }} -DCMAKE_TOOLCHAIN_FILE=../submodules/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=${{ parameters.configuration }} -DUSE_CPPRESTSDK=${{ parameters.useCppRestSDK }}
@@ -67,7 +67,7 @@ jobs:
         displayName: Run tests
 
     - ${{ parameters.afterBuild }}
-  
+
     - task: PublishTestResults@2
       displayName: Publish test results
       condition: always()

azure-pipelines.yml

@@ -47,9 +47,7 @@ stages:
       jobName: Mac_Build_Test_With_CppRestSDK
       useCppRestSDK: true
       beforeBuild:
-      - script: brew install gcc
-        displayName: Install gcc
-      - bash: "./submodules/vcpkg/bootstrap-vcpkg.sh"
+      - bash: "./submodules/vcpkg/bootstrap-vcpkg.sh --allowAppleClang"
         condition: ne(variables.CACHE_RESTORED, 'true')
         displayName: Bootstrap vcpkg
       - bash: "./submodules/vcpkg/vcpkg install cpprestsdk"
@@ -68,7 +66,7 @@ stages:
       - bash: "./submodules/vcpkg/vcpkg install cpprestsdk boost-system boost-chrono boost-thread --vcpkg-root ./submodules/vcpkg"
         condition: ne(variables.CACHE_RESTORED, 'true')
         displayName: vcpkg install dependencies
-      - bash: "sudo apt install valgrind"
+      - bash: "sudo apt-get update && sudo apt install valgrind"
         displayName: install valgrind
 
   - template: .azure/default-build.yml
@@ -77,7 +75,7 @@ stages:
       jobName: Linux_Build_Test
       useCppRestSDK: false
       beforeBuild:
-      - bash: "sudo apt install valgrind"
+      - bash: "sudo apt-get update && sudo apt install valgrind"
         displayName: install valgrind
 
   - template: .azure/default-build.yml