Remove support for VS2015 from ILSpy.AddIn

ILSpy.AddIn/source.extension.vsixmanifest

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PackageManifest Version="2.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2011" xmlns:d="http://schemas.microsoft.com/developer/vsx-schema-design/2011">
   <Metadata>
-    <Identity Id="a9120dbe-164a-4891-842f-fb7829273838" Version="1.7.2.0" Language="en-US" Publisher="ic#code" />
+    <Identity Id="a9120dbe-164a-4891-842f-fb7829273838" Version="1.7.3.0" Language="en-US" Publisher="ic#code" />
     <DisplayName>ILSpy</DisplayName>
     <Description xml:space="preserve">Integrates the ILSpy decompiler into Visual Studio.</Description>
     <MoreInfo>http://www.ilspy.net</MoreInfo>
@@ -9,11 +9,11 @@
     <Icon>ILSpy-Large.ico</Icon>
   </Metadata>
   <Installation>
-    <InstallationTarget Id="Microsoft.VisualStudio.Ultimate" Version="[14.0,15.0]" />
-    <InstallationTarget Id="Microsoft.VisualStudio.Premium" Version="[14.0,15.0]" />
-    <InstallationTarget Id="Microsoft.VisualStudio.Enterprise" Version="[14.0,15.0]" />
-    <InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="[14.0,15.0]" />
-    <InstallationTarget Id="Microsoft.VisualStudio.Community" Version="[14.0,15.0]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Ultimate" Version="[15.0,15.0]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Premium" Version="[15.0,15.0]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Enterprise" Version="[15.0,15.0]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="[15.0,15.0]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Community" Version="[15.0,15.0]" />
   </Installation>
   <Dependencies>
     <Dependency Id="Microsoft.Framework.NDP" DisplayName="Microsoft .NET Framework" d:Source="Manual" Version="[4.5,)" />