Update requirements files

requirements.in

 requests
+numpy
+pandas
+python-slugify
+ujson

requirements.txt

@@ -5,7 +5,15 @@
 #    pip-compile
 #
 certifi==2020.12.5        # via requests
-chardet==4.0.0            # via -r requirements.in, requests
+chardet==4.0.0            # via requests
 idna==2.10                # via requests
+numpy==1.20.1             # via -r requirements.in, pandas
+pandas==1.2.2             # via -r requirements.in
+python-dateutil==2.8.1    # via pandas
+python-slugify==4.0.1     # via -r requirements.in
+pytz==2021.1              # via pandas
 requests==2.25.1          # via -r requirements.in
+six==1.15.0               # via python-dateutil
+text-unidecode==1.3       # via python-slugify
+ujson==4.0.2              # via -r requirements.in
 urllib3==1.26.3           # via requests