fixing appveyor build

Author: vojtechhabarta

appveyor.yml

@@ -13,7 +13,7 @@ build_script:
 - ps: |-
     Write-Host -ForegroundColor Cyan "Building version: $($env:APPVEYOR_BUILD_VERSION)"
     choco install maven -version 3.3.9.1 -y
-    $mvn = "C:\tools\apache-maven-3.3.9.1\bin\mvn.cmd"
+    $mvn = "C:\tools\apache-maven-3.3.9\bin\mvn.cmd"
     &$mvn --batch-mode versions:set "-DnewVersion=$($env:APPVEYOR_BUILD_VERSION)"; if ($LASTEXITCODE -ne 0) { throw "Build failed" }
     &$mvn --batch-mode -P attach-artifacts clean install -P local-deploy; if ($LASTEXITCODE -ne 0) { throw "Build failed" }
     if ($env:APPVEYOR_REPO_BRANCH -eq "master" -and -not $env:APPVEYOR_PULL_REQUEST_NUMBER)