Update version for UWP (#138)

Update version for UWP

Author: phraemer

samples/Catalog/windows/Catalog/Catalog.csproj

@@ -234,7 +234,7 @@
     <SDKReference Include="Microsoft.VCLibs, Version=14.0">
       <Name>Visual C++ 2015 Runtime for Universal Windows Platform Apps</Name>
     </SDKReference>
-    <SDKReference Include="PSPDFKitSDK, Version=1.6.1">
+    <SDKReference Include="PSPDFKitSDK, Version=1.7.1">
       <Name>PSPDFKit for UWP</Name>
     </SDKReference>
   </ItemGroup>

windows/ReactNativePSPDFKit/ReactNativePSPDFKit/ReactNativePSPDFKit.csproj

@@ -137,7 +137,7 @@
     <SDKReference Include="Microsoft.VCLibs, Version=14.0">
       <Name>Visual C++ 2015 Runtime for Universal Windows Platform Apps</Name>
     </SDKReference>
-    <SDKReference Include="PSPDFKitSDK, Version=1.6.1">
+    <SDKReference Include="PSPDFKitSDK, Version=1.7.1">
       <Name>PSPDFKit for UWP</Name>
     </SDKReference>
   </ItemGroup>