Removed duplicate curly brace (#136)

* Removed duplicate curly brace

* Update FirebaseAuthProvider.cs

* Merged with master, upped nuget version

Author: sheindel

src/Firebase.Auth/Firebase.Auth.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard1.1</TargetFramework>
     <PackageId>FirebaseAuthentication.net</PackageId>
-    <PackageVersion>3.5.0</PackageVersion>
+    <PackageVersion>3.6.0</PackageVersion>
     <Authors>Step Up Labs, Inc.</Authors>
     <Description>Firebase authentication library. It can generate Firebase auth token based on given OAuth token (issued by Google, Facebook...). This Firebase token can then be used with REST queries against Firebase endpoints. </Description>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>

src/Firebase.Auth/FirebaseAuthProvider.cs

@@ -165,10 +165,10 @@ public async Task<FirebaseAuthLink> SignInWithEmailAndPasswordAsync(string email
 
             if (tenantId != null)
             {
-                sb.Append($"\"tenantId\":\"{tenantId}\"");
+                sb.Append($"\"tenantId\":\"{tenantId}\",");
             }
 
-            sb.Append("\"returnSecureToken\":true}}");
+            sb.Append("\"returnSecureToken\":true}");
 
             FirebaseAuthLink firebaseAuthLink = await this.ExecuteWithPostContentAsync(GooglePasswordUrl, sb.ToString()).ConfigureAwait(false);
             firebaseAuthLink.User = await this.GetUserAsync(firebaseAuthLink.FirebaseToken).ConfigureAwait(false);