Custom cel shaded Unity shader not casting shadows

I'm having an issue where my custom cel shading Shader (Wow that's redundant!) is creating the cel shaded effect I want, but it's not casting shadows.

I followed this tutorial here http://www.gamasutra.com/blogs/DavidLeon/20150702/247602/NextGen_Cel_Shading_in_Unity_5.php

Here is the code and what it looks like right now.

 Shader "Maiko/CelShader7"
 {
     Properties
     {
         _Color("Main Color", Color) = (1, 1, 1, 1)
         _MainTex("Albedo (RGB)", 2D) = "white" {}
     }
 
         SubShader
         {
             Tags
             {
                 "RenderType" = "Opaque"
             }
         LOD 200
 
         CGPROGRAM
         #pragma surface surf CelShadingForward
         #pragma    target 3.0
         #include "AutoLight.cginc"
         #define UnityStandardBRDFCustom.cginc
 
         half4 LightingCelShadingForward(SurfaceOutput s, half3 lightDir, half atten)
     {
         half NdotL = dot(s.Normal, lightDir);
         if (NdotL <= 0.0) NdotL = 0.14f;
         else if (NdotL > 0.0f && NdotL <= 0.1f) NdotL = 0.15f;
         else if (NdotL > 0.1f && NdotL <= 0.2f) NdotL = 0.2f;
         else if (NdotL > 0.2f && NdotL <= 0.3f) NdotL = 0.3f;
         else if (NdotL > 0.3f && NdotL <= 0.4f) NdotL = 0.4f;
         else if (NdotL > 0.4f && NdotL <= 0.5f) NdotL = 0.5f;
         else if (NdotL > 0.5f && NdotL <= 0.6f) NdotL = 0.6f;
         else if (NdotL > 0.6f && NdotL <= 0.7f) NdotL = 0.7f;
         else if (NdotL > 0.7f && NdotL <= 0.8f) NdotL = 0.8f;
         else if (NdotL > 0.8f && NdotL <= 0.9f) NdotL = 0.9f;
         else NdotL = 1;
 
         NdotL = smoothstep(0, 0.625f, NdotL);
         NdotL /= 2.5f;
 
 
         half4 c;
         c.rgb = s.Albedo * _LightColor0.rgb * (NdotL * atten  * 2); // THe *2 makes it brighter
         c.a = s.Alpha;
         return c;
     }
 
 
 
     sampler2D _MainTex;
     fixed4 _Color;
 
     struct Input
     {
         fixed2 uv_MainTex;
 
     };
 
     void surf(Input IN, inout SurfaceOutput o) {
         // Albedo comes from a texture tinted by color
         fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
         o.Albedo = c.rgb;
         o.Alpha = c.a;
     }
     ENDCG
     } // End of Subshader
         FallBack "Diffuse"
 
 }