Update server4.py

server4.py

@@ -127,7 +127,8 @@ def update():
     
     if not is_installed('npm'):
         install_package('npm')
-    os.system("pip install -U kaggle > /dev/null 2>&1")            
+    os.system("pip uninstall -y kaggle > /dev/null 2>&1")    
+    os.system("pip install kaggle==1.5.6 > /dev/null 2>&1") 
     # os.system("apt-get install inotify-tools > /dev/null 2>&1")
     os.system("pip install ruamel.yaml > /dev/null 2>&1")  # install ruamel.yaml to solve the import issue
     os.system("pip install pexpect > /dev/null 2>&1")