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Given a string, shift each letter in the string one character up,
and return the new string. If the next character goes past 'z',
come around to the letter 'a'.
For example:
"apple" = "bqqmf"
"zim" = "ajn"
Create a function called shiftLetterUp() that takes one parameter, a string, and returns the new string with shifted letters.
When you sign up, you'll get access to a test runner with some assertions to make sure that your solution works.