Use post-release versioning and fixed deploy condition

Author: adriangodong

appveyor.yml

@@ -2,10 +2,22 @@ image: Visual Studio 2017
 configuration: Release
 version: '{build}'
 
+install:
+- ps: >-
+    if ($env:APPVEYOR_REPO_TAG -eq "false")
+    {
+      $env:COMMIT_DESCRIPTION = git describe --tags
+    }
+    else
+    {
+      $env:COMMIT_DESCRIPTION = $env:APPVEYOR_REPO_TAG_NAME
+    }
+    Write-Host Build version is $env:COMMIT_DESCRIPTION
+
 dotnet_csproj:
   patch: true
   file: 'Medium\Medium.csproj'
-  version: $(appveyor_repo_tag_name)
+  version: $(commit_description)
 
 before_build:
 - cmd: dotnet restore
@@ -25,4 +37,4 @@ deploy:
   api_key:
     secure: y7n963kT1eor3dpj742k0mwnMPXsWGnljEGlfUr2zaGgqtMOJ4OegiWmLctuGYlY
   on:
-    appveyor_repo_tag: master
+    appveyor_repo_tag: true