adjusted crawler joint and mass

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

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+  m_Mass: 2
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   m_LocalScale: {x: 1, y: 1, z: 1}
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Project/Assets/ML-Agents/Examples/Crawler/Prefabs/DynamicPlatform.prefab

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

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Project/Assets/ML-Agents/Examples/Crawler/Scenes/CrawlerDynamicTarget.unity

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Project/Assets/ML-Agents/Examples/Crawler/Scenes/CrawlerStaticTarget.unity

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Project/Assets/ML-Agents/Examples/Crawler/Scripts/CrawlerAgent.cs

     {
         if (detectTargets)
         {
-            foreach (var bodyPart in m_JdController.bodyPartsDict.Values)
+            foreach (var bodyPart in m_JdController.bodyPartsList)
             {
                 if (bodyPart.targetContact && bodyPart.targetContact.touchingTarget)
                 {