fix hardcoded version to $version$ in nuspec

Author: Tom Laird-McConnell

CSharp/Library/Microsoft.Bot.Builder/Microsoft.Bot.Builder.nuspec

@@ -28,7 +28,7 @@
       <dependency id="Autofac" version="3.5.2"/>
       <dependency id="Chronic.Signed" version="0.3.2" />
       <dependency id="Microsoft.AspNet.WebAPI.Core" version="5.2.3" />
-      <dependency id="Microsoft.Bot.Connector" version="3.15.3" />
+      <dependency id="Microsoft.Bot.Connector" version="$version$" />
       <dependency id="Microsoft.Rest.ClientRuntime" version="2.3.2" />
       <dependency id="Newtonsoft.Json" version="9.0.1" />
       <dependency id="System.IdentityModel.Tokens.Jwt" version="5.1.4" />

CSharp/Library/Microsoft.Bot.Connector.AspNetCore/Microsoft.Bot.Connector.AspNetCore.nuspec

@@ -22,7 +22,7 @@
         <dependency id="Newtonsoft.Json" version="9.0.1" />
         <dependency id="System.IdentityModel.Tokens.Jwt" version="5.1.4" />
         <dependency id="Microsoft.AspNetCore.Mvc.Core" version="1.1.4" />
-        <dependency id="Microsoft.Bot.Connector" version="3.16.0.0" />
+        <dependency id="Microsoft.Bot.Connector" version="$version$" />
       </group>
     </dependencies>
   </metadata>

CSharp/Library/Microsoft.Bot.Connector.AspNetCore2/Microsoft.Bot.Connector.AspNetCore2.nuspec

@@ -19,7 +19,7 @@
         <dependency id="Microsoft.AspNetCore.Authentication.JwtBearer" version="2.0.0" />
         <dependency id="Microsoft.AspNetCore.Mvc" version="2.0.0" />
         <dependency id="Microsoft.Rest.ClientRuntime" version="2.3.10" />
-        <dependency id="Microsoft.Bot.Connector" version="3.16.0.0" />
+        <dependency id="Microsoft.Bot.Connector" version="$version$" />
       </group>
     </dependencies>
   </metadata>

CSharp/Library/Microsoft.Bot.Connector.Falcon/Microsoft.Bot.Connector.nuspec

@@ -2,7 +2,7 @@
 <package xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <metadata xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
     <id>Microsoft.Bot.Connector</id>
-    <version>3.16.0.0</version>
+    <version>$version$</version>
     <authors>Microsoft</authors>
     <owners>microsoft, BotFramework, nugetbotbuilder </owners>
     <iconUrl>https://bots.botframework.com/Client/Images/bot-framework-default-7.png</iconUrl>