Explicit version ranges for Json.NET dependency

Author: gmarz

build/Elasticsearch.Net.JsonNET.nuspec

@@ -14,7 +14,7 @@
 		<description>This package is only useful if you use the low level client ONLY and do not use NEST but would like to use JSON.NET as your serializer</description>
 		<dependencies>
 			<dependency id="Elasticsearch.Net" version="1.6.0"/>
-			<dependency id="Newtonsoft.Json" version="6.0.1"/>
+			<dependency id="Newtonsoft.Json" version="[6,8)"/>
 		</dependencies>
 		<tags>elasticsearch elastic search lucene thrift nest</tags>
 	</metadata>

build/NEST.nuspec

@@ -14,7 +14,7 @@
 		<description>Elasticsearch client, strongly typed interface to Elasticsearch. Fluent request builder, mapped responses and powerful query dsl. Uses and exposes Elasticsearch.Net</description>
 		<dependencies>
 			<dependency id="Elasticsearch.Net" version="1.6.0"/>
-			<dependency id="Newtonsoft.Json" version="6.0.1" />
+			<dependency id="Newtonsoft.Json" version="[6,8)" />
 		</dependencies>
 		<tags>elasticsearch elastic search lucene nest</tags>
 	</metadata>