Update library to version GitHub recommends

Author: Steve Salas

dotnet-tracer/main/OpenCover.Specs/OpenCover.Specs.csproj

@@ -35,9 +35,8 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DotNetZip, Version=1.10.1.0, Culture=neutral, PublicKeyToken=6583c7c814667745, processorArchitecture=MSIL">
-      <HintPath>..\packages\DotNetZip.1.10.1\lib\net20\DotNetZip.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="DotNetZip, Version=1.11.0.0, Culture=neutral, PublicKeyToken=6583c7c814667745, processorArchitecture=MSIL">
+      <HintPath>..\packages\DotNetZip.1.11.0\lib\net20\DotNetZip.dll</HintPath>
     </Reference>
     <Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <HintPath>..\packages\Newtonsoft.Json.10.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>

dotnet-tracer/main/OpenCover.Specs/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DotNetZip" version="1.10.1" targetFramework="net452" />
+  <package id="DotNetZip" version="1.11.0" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net452" />
   <package id="NUnit" version="3.9.0" targetFramework="net452" />
   <package id="SpecFlow" version="2.2.1" targetFramework="net452" />