Upgrade to Esprima 3.0.0-rc-01 (#1464)

Jint/Jint.csproj

@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Esprima" Version="3.0.0-beta-10" />
+    <PackageReference Include="Esprima" Version="3.0.0-rc-01" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="all" />
     <PackageReference Include="Nullable" Version="1.3.1" PrivateAssets="all" />
   </ItemGroup>

Jint/Messages.cs

@@ -0,0 +1,9 @@
+namespace Jint;
+
+/// <summary>
+/// Helper to map Esprima error messages.
+/// </summary>
+internal static class Messages
+{
+    public const string InvalidLHSInAssignment = "Invalid left-hand side in assignment";
+}