Update Web.config

Author: fabiocav

src/WebJobs.Script.WebHost/Web.config

@@ -40,7 +40,7 @@
            this is a breaking change for them. Before making any changes, please make sure this is
            discussed and validated.
        -->
-      <httpRuntime targetFramework="4.6.2" maxRequestLength="102400" maxUrlLength="8192" maxQueryStringLength="4096" requestPathInvalidCharacters="" enableVersionHeader="false"/>
+      <httpRuntime targetFramework="4.6.2" maxRequestLength="102400" maxUrlLength="8192" maxQueryStringLength="4096" requestPathInvalidCharacters="" enableVersionHeader="false" relaxedUrlToFileSystemMapping="true"/>
     </system.web>
   </location>
   <system.webServer>