update Unity version to 2017.4.

ProjectSettings/GraphicsSettings.asset

@@ -3,7 +3,7 @@
 --- !u!30 &1
 GraphicsSettings:
   m_ObjectHideFlags: 0
-  serializedVersion: 12
+  serializedVersion: 9
   m_Deferred:
     m_Mode: 1
     m_Shader: {fileID: 69, guid: 0000000000000000f000000000000000, type: 0}
@@ -39,24 +39,26 @@ GraphicsSettings:
   m_PreloadedShaders: []
   m_SpritesDefaultMaterial: {fileID: 10754, guid: 0000000000000000f000000000000000,
     type: 0}
-  m_CustomRenderPipeline: {fileID: 0}
-  m_TransparencySortMode: 0
-  m_TransparencySortAxis: {x: 0, y: 0, z: 1}
+  m_TierSettings_Tier1:
+    renderingPath: 1
+    useCascadedShadowMaps: 1
+  m_TierSettings_Tier2:
+    renderingPath: 1
+    useCascadedShadowMaps: 1
+  m_TierSettings_Tier3:
+    renderingPath: 1
+    useCascadedShadowMaps: 1
   m_DefaultRenderingPath: 1
   m_DefaultMobileRenderingPath: 1
   m_TierSettings: []
   m_LightmapStripping: 0
   m_FogStripping: 0
-  m_InstancingStripping: 0
   m_LightmapKeepPlain: 1
   m_LightmapKeepDirCombined: 1
+  m_LightmapKeepDirSeparate: 1
   m_LightmapKeepDynamicPlain: 1
   m_LightmapKeepDynamicDirCombined: 1
-  m_LightmapKeepShadowMask: 1
-  m_LightmapKeepSubtractive: 1
+  m_LightmapKeepDynamicDirSeparate: 1
   m_FogKeepLinear: 1
   m_FogKeepExp: 1
   m_FogKeepExp2: 1
-  m_AlbedoSwatchInfos: []
-  m_LightsUseLinearIntensity: 0
-  m_LightsUseColorTemperature: 0