Inject version from git tag

Author: rdegnan

.gitignore

@@ -331,4 +331,6 @@ ASALocalRun/
 .mfractor/
 
 # Local History for Visual Studio
-.localhistory/
+.localhistory/
+
+*.DS_Store

.travis.yml

@@ -7,11 +7,11 @@ env:
 script:
 - dotnet build -c Release
 - dotnet test
-- dotnet pack -c Release
+before_deploy:
+- dotnet pack -c Release -p:Version=$TRAVIS_TAG
 deploy:
   skip_cleanup: true
   provider: script
   script: dotnet nuget push /home/travis/build/rsocket/rsocket-net/RSocket.Core/bin/Release/RSocket.Core.*.nupkg --api-key $NUGET_API_KEY --source https://api.nuget.org/v3/index.json
   on:
     tags: true
-#    condition: $TRAVIS_TAG =~ ^(\d+\.)?(\d+\.)?(\*|\d+)$

RSocket.Core/RSocket.Core.csproj

@@ -4,7 +4,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <RootNamespace>RSocket</RootNamespace>
     <LangVersion>latest</LangVersion>
-    <Version>0.1.0</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">