remove lightfm

Author: sarahmish

docs/getting_started/concepts.rst

@@ -113,7 +113,6 @@ corresponding functions or classes, which can also be found in the `mlprimitives
 Examples
 ********
 
-* LightFM
 * Keras Sequential LSTMTextClassifier
 * NetworkX Graph Feature Extraction
 

mlprimitives/adapters/lightfm.py

@@ -16,7 +16,6 @@
     'featuretools>=0.6.1,<0.23',
     'iso639>=0.1.4,<0.2',
     'langdetect>=1.0.7,<2',
-    'lightfm>=1.15,<2',
     'mlblocks>=0.6,<0.7',
     'networkx>=2.0,<3',
     'nltk>=3.3,<4',