Update nuspec dependencies.

Author: rstam

build/MongoDB.Driver.Core.nuspec

@@ -15,6 +15,7 @@
     <dependencies>
       <group targetFramework=".NETFramework4.5">
         <dependency id="System.Runtime.InteropServices.RuntimeInformation" version="[4.0.0, )" />
+        <dependency id="DnsClient" version="[1.0.7, )" />
         <dependency id="MongoDB.Bson" version="[@driverPackageVersion@, )" />
       </group>
       <group targetFramework=".NETStandard1.5">
@@ -24,6 +25,7 @@
         <dependency id="System.Net.NameResolution" version="[4.0.0, )" />
         <dependency id="System.Net.Security" version="[4.0.0, )" />
         <dependency id="System.Security.SecureString" version="[4.0.0, )" />
+        <dependency id="DnsClient" version="[1.0.7, )" />
         <dependency id="MongoDB.Bson" version="[@driverPackageVersion@, )" />
       </group>
     </dependencies>

build/MongoDB.Driver.nuspec

@@ -19,6 +19,7 @@
       </group>
       <group targetFramework=".NETStandard1.5">
         <dependency id="NETStandard.Library" version="[1.6.0, )" />
+        <dependency id="System.ComponentModel.TypeConverter" version="[4.1.0, )" />
         <dependency id="System.Linq.Queryable" version="[4.0.1, )" />
         <dependency id="MongoDB.Bson" version="[@driverPackageVersion@, )" />
         <dependency id="MongoDB.Driver.Core" version="[@driverPackageVersion@, )" />

build/mongocsharpdriver.nuspec

@@ -15,12 +15,16 @@
     <language>en-US</language>
     <dependencies>
       <group targetFramework=".NETFramework4.5">
+        <dependency id="DnsClient" version="[1.0.7, )" />
         <dependency id="MongoDB.Bson" version="[@driverPackageVersion@, )" />
         <dependency id="MongoDB.Driver.Core" version="[@driverPackageVersion@, )" />
         <dependency id="MongoDB.Driver" version="[@driverPackageVersion@, )" />
       </group>
       <group targetFramework=".NETStandard1.5">
         <dependency id="NETStandard.Library" version="[1.6.0, )" />
+        <dependency id="System.ComponentModel.TypeConverter" version="[4.1.0, )" />
+        <dependency id="System.Linq.Queryable" version="[4.0.1, )" />
+        <dependency id="DnsClient" version="[1.0.7, )" />
         <dependency id="MongoDB.Bson" version="[@driverPackageVersion@, )" />
         <dependency id="MongoDB.Driver.Core" version="[@driverPackageVersion@, )" />
         <dependency id="MongoDB.Driver" version="[@driverPackageVersion@, )" />