Create a function that takes a list of strings and returns a dictionary.
str_to_dict(["1=one", "2=two", "3=three", "4=four"]) ➞ {"1": "one", "2": "two", "3": "three", "4": "four"}
str_to_dict(["dog=bark", "cat=meow", "cow=moo"]) ➞ {"dog": "bark", "cat": "meow", "cow": "moo"}
str_to_dict(["bob=human", "lola=dog", "mittens=cat", "todd=frog"]) ➞ {"bob": "human", "lola": "dog", "mittens": "cat", "todd": "frog"}
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