Update Polly.Caching.Memory.nuspec

7.0.x prior to 7.0.2 contain a bug

Author: KoLogicDev

src/Polly.Caching.Memory.nuspec

@@ -58,7 +58,7 @@
     <dependencies>
       <group targetFramework="netstandard1.3">
         <dependency id="NETStandard.Library" version="1.6.1" />
-        <dependency id="Polly" version="7.0.0" />
+        <dependency id="Polly" version="7.0.2" />
         <dependency id="Microsoft.Extensions.Caching.Memory" version="1.1.2" />
         <dependency id="System.ValueTuple" version="4.5.0" />
       </group>