Added ripgrep dependency on vcredist2015

This dependency requirement should go away once rust-lang/rust#37545
is implemented.

I'm creating version 0.2.9.1, which points to upstream 0.2.9 as a
package only version to get this dependency in.

packages/ripgrep/ripgrep.nuspec

@@ -4,14 +4,16 @@
   <metadata>
     <id>ripgrep</id>
     <title>ripgrep</title>
-    <version>0.2.9</version>
+    <version>0.2.9.1</version>
     <authors>BurntSushi</authors>
     <owners>Daniel Santa Cruz</owners>
     <summary>A search tool that combines the usability of ag with the raw speed of grep.</summary>
     <description>
       ripgrep is a command line search tool that combines the usability of The Silver Searcher (an ack clone)
       with the raw speed of GNU grep. ripgrep has first class support on Windows, Mac and Linux, with binary
       downloads available for every release.
+
+      We are currently depending on Visual C++ Redistributable for Visual Studio 2015 https://chocolatey.org/packages/vcredist2015. This will change once this https://github.com/rust-lang/rust/pull/37545 is resolved and ripgrep can statically link the CRT.
     </description>
     <projectUrl>https://github.com/BurntSushi/ripgrep</projectUrl>
     <projectSourceUrl>https://github.com/BurntSushi/ripgrep</projectSourceUrl>
@@ -23,6 +25,9 @@
     <copyright></copyright>
     <licenseUrl>https://github.com/BurntSushi/ripgrep/blob/0.2.9/LICENSE-MIT</licenseUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <dependencies>
+      <dependency id="vcredist2015" />
+    </dependencies>
   </metadata>
   <files>
     <file src="tools\**" target="tools" />

packages/ripgrep/tools/chocolateyinstall.ps1

@@ -1,10 +1,11 @@
 $ErrorActionPreference = 'Stop';
 
+$version     = "0.2.9"
 $packageName = $env:chocolateyPackageName
 $toolsDir    = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
 
-$url         = ("https://github.com/BurntSushi/ripgrep/releases/download/{0}/ripgrep-{0}-i686-pc-windows-msvc.zip" -f $env:chocolateyPackageVersion)
-$url64       = ("https://github.com/BurntSushi/ripgrep/releases/download/{0}/ripgrep-{0}-x86_64-pc-windows-msvc.zip" -f $env:chocolateyPackageVersion)
+$url         = ("https://github.com/BurntSushi/ripgrep/releases/download/{0}/ripgrep-{0}-i686-pc-windows-msvc.zip" -f $version)
+$url64       = ("https://github.com/BurntSushi/ripgrep/releases/download/{0}/ripgrep-{0}-x86_64-pc-windows-msvc.zip" -f $version)
 
 $packageArgs = @{
   packageName    = $packageName