Update 1 NuGet dependencies

***NO_CI***

Author: nfbot

nanoFramework.System.Math.Benchmark/nanoFramework.System.Math.Benchmark.nfproj

@@ -39,7 +39,7 @@
       <HintPath>..\packages\nanoFramework.Benchmark.2.0.0-preview.1\lib\netnano1.0\nanoFramework.Benchmark.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.Logging.2.0.0-preview.20\lib\netnano1.0\nanoFramework.Logging.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.Logging.2.0.0-preview.21\lib\netnano1.0\nanoFramework.Logging.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.Runtime.Native, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.Runtime.Native.2.0.0-preview.24\lib\netnano1.0\nanoFramework.Runtime.Native.dll</HintPath>

nanoFramework.System.Math.Benchmark/packages.config

@@ -2,7 +2,7 @@
 <packages>
   <package id="nanoFramework.Benchmark" version="2.0.0-preview.1" targetFramework="netnano1.0" />
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
-  <package id="nanoFramework.Logging" version="2.0.0-preview.20" targetFramework="netnano1.0" />
+  <package id="nanoFramework.Logging" version="2.0.0-preview.21" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Native" version="2.0.0-preview.24" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Collections" version="2.0.0-preview.14" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Diagnostics.Stopwatch" version="2.0.0-preview.59" targetFramework="netnano1.0" />

nanoFramework.System.Math.Benchmark/packages.lock.json

@@ -16,9 +16,9 @@
       },
       "nanoFramework.Logging": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.20, 2.0.0-preview.20]",
-        "resolved": "2.0.0-preview.20",
-        "contentHash": "3Q/B9J4JzXd6HfNYm0sALSo8ujQIEmQz3txdn7PqeG/3OSrdgRLKuwsNhq7OGh9QYduFXhunRMtkLPoeT2T9hw=="
+        "requested": "[2.0.0-preview.21, 2.0.0-preview.21]",
+        "resolved": "2.0.0-preview.21",
+        "contentHash": "nu+9/LCoFTkYbEg+fo3qIIlOk6Tli89klhH8MAPi0++jj/ycTNmPVhAPhfwaKx5xCskxs+4v4xiheIxAaOaFmw=="
       },
       "nanoFramework.Runtime.Native": {
         "type": "Direct",