Switch to using PackageLicenseExpression

* update .gitignore

Author: lahma

.gitignore

@@ -59,7 +59,7 @@ PublishProfiles/
 
 # NuGet Packages
 packages/
-*.nupkg
+nuget/
 
 # Others
 .build/
@@ -77,4 +77,6 @@ packages/
 _UpgradeReport_Files/
 Backup*/
 UpgradeLog.htm
-UpgradeLog*.XML
+UpgradeLog*.XML
+
+.idea

build/nuget-common.props

@@ -4,7 +4,7 @@
     <Authors>Andrey Taritsyn</Authors>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageCommonTags>JavaScriptEngineSwitcher;JavaScript;ECMAScript</PackageCommonTags>
-    <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageLicenseFullPath>../../LICENSE.txt</PackageLicenseFullPath>
     <PackageIcon>icon.png</PackageIcon>
     <PackageProjectUrl>https://github.com/Taritsyn/JavaScriptEngineSwitcher</PackageProjectUrl>