Added missing this to extension methods.

src/Volo.Abp.AspNetCore/Microsoft/AspNetCore/Hosting/AbpHostingEnvironmentExtensions.cs

@@ -4,7 +4,7 @@ namespace Microsoft.AspNetCore.Hosting
 {
     public static class AbpHostingEnvironmentExtensions
     {
-        public static IConfigurationRoot GetConfiguration(IHostingEnvironment env, string fileName = "appsettings")
+        public static IConfigurationRoot BuildConfiguration(this IHostingEnvironment env, string fileName = "appsettings")
         {
             var builder = new ConfigurationBuilder()
                 .SetBasePath(env.ContentRootPath)

src/Volo.Abp.AspNetCore/Microsoft/Extensions/DependencyInjection/AbpAspNetCoreServiceCollectionExtensions.cs

@@ -4,7 +4,7 @@ namespace Microsoft.Extensions.DependencyInjection
 {
     public static class AbpAspNetCoreServiceCollectionExtensions
     {
-        public static IHostingEnvironment GetHostingEnvironment(IServiceCollection services)
+        public static IHostingEnvironment GetHostingEnvironment(this IServiceCollection services)
         {
             return services.GetSingletonInstance<IHostingEnvironment>();
         }