[bug-fix] Increase height of wall in CrawlerStatic (#3650)

Project/Assets/ML-Agents/Examples/Crawler/Prefabs/FixedPlatform.prefab

   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: CrawlerStatic
-  m_TeamID: 0
-  m_useChildSensors: 1
+  TeamId: 0
+  m_UseChildSensors: 1
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+  hasUpgradedFromAgentParameters: 1
   maxStep: 5000
   target: {fileID: 4749909135913778}
   ground: {fileID: 4856650706546504}
   m_Name: 
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   DecisionPeriod: 5
-  RepeatAction: 0
+  TakeActionsBetweenDecisions: 0
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-  m_LocalPosition: {x: -0, y: 0.5, z: 0}
-  m_LocalScale: {x: 0.01, y: 0.01, z: 0.01}
+  m_LocalPosition: {x: -0, y: 1.5, z: 0}
+  m_LocalScale: {x: 0.01, y: 0.03, z: 0.01}
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com.unity.ml-agents/CHANGELOG.md

 
 ### Minor Changes
  - Format of console output has changed slightly and now matches the name of the model/summary directory. (#3630, #3616)
+ - Raise the wall in CrawlerStatic scene to prevent Agent from falling off. (#3650)
  - Renamed 'Generalization' feature to 'Environment Parameter Randomization'.
 
 ## [0.15.0-preview] - 2020-03-18