add old files requirements.txt

data/word_sets/mammal.txt

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+Human
+Lion
+Tiger
+Elephant
+Gorilla
+Chimpanzee
+Giraffe
+Zebra
+Cheetah
+Leopard
+Panda
+Kangaroo
+Koala
+Sloth
+Lemur
+Orangutan
+Baboon
+Wolf
+Fox
+Bear
+Polar Bear
+Grizzly Bear
+Black Bear
+Otter
+Sea Lion
+Walrus
+Seal
+Dolphin
+Whale
+Orca (Killer Whale)
+Moose
+Elk
+Deer
+Caribou
+Bison
+Buffalo
+Antelope
+Gazelle
+Camel
+Alpaca
+Llama
+Hippopotamus
+Rhinoceros
+Boar
+Pig
+Warthog
+Cow
+Sheep
+Goat
+Horse
+Donkey
+Mule
+Dog
+Cat
+Rabbit
+Hare
+Squirrel
+Chipmunk
+Beaver
+Rat
+Mouse
+Porcupine
+Hedgehog
+Bat
+Armadillo
+Pangolin
+Aardvark
+Platypus
+Echidna
+Opossum
+Raccoon
+Skunk
+Weasel
+Mink
+Ferret
+Badger
+Wolverine
+Hyena
+Meerkat
+Coyote
+Lynx
+Bobcat
+Cougar (Mountain Lion)
+Jaguar
+Snow Leopard
+Dugong
+Manatee
+Tasmanian Devil
+Quokka
+Numbat
+Dingo
+Aye-Aye
+Tenrec
+Okapi
+Vicuna
+Marten
+Kinkajou
+Tamarin
+Capuchin
+Proboscis Monkey