Remove unneeded imports

Author: minimaxir

text_generator_keras.py

@@ -1,7 +1,7 @@
 from __future__ import print_function
-from keras.models import Sequential, Model
-from keras.layers import Dense, Activation, Dropout, Embedding, Flatten
-from keras.layers import LSTM, Convolution1D, MaxPooling1D, Bidirectional, TimeDistributed, GRU, Input, merge, AveragePooling1D, SimpleRNN
+from keras.models import Model
+from keras.layers import Dense, Activation, Embedding
+from keras.layers import LSTM, Input
 from keras.layers.merge import concatenate
 from keras.optimizers import RMSprop, Adam
 from keras.utils.data_utils import get_file