Update Dockerfile

Dockerfile

@@ -10,8 +10,10 @@ COPY requirements.txt /
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Will execute nltk.download('wordnet')
-COPY post_install.py .
-RUN python post_install.py
+#COPY post_install.py .
+#RUN python post_install.py
+
+RUN [ "python", "-c", "import nltk; nltk.download('wordnet', download_dir='/usr/local/nltk_data')" ]
 
 # Copy the code files
 COPY src /