Update app.py

app.py

@@ -19,7 +19,7 @@ try:
     from openbabel import openbabel
 except:
     print ("openbabel not found, Installing openbabel ")
-    os.system("wget https://repo.continuum.io/miniconda/Miniconda3-4.5.4-Linux-x86_64.sh && bash Miniconda3-4.5.4-Linux-x86_64.sh -bfp /usr/local")
+    os.system("wget 'https://repo.continuum.io/miniconda/Miniconda3-4.5.4-Linux-x86_64.sh' && bash Miniconda3-4.5.4-Linux-x86_64.sh -bfp /usr/local")
     os.system("conda install -c conda-forge openbabel -y")
     from openbabel import openbabel