Merge pull request #38 from scraggard/master

[FEATURE] added fibonacci

snippets/fibonacci_until_num.md

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+### fibonacci_until_num
+
+Returns the n-th term in a Fibonnaci sequence that starts with 1
+
+A term in a Fibonnaci sequence is the sum of the two previous terms.
+This function recursively calls the function to find the n-th term.
+
+``` python
+def fibonacci_until_num(n):
+  if n < 3:
+    return 1
+  return fibonacci_until_num(n - 2) + fibonacci_until_num(n - 1)
+```
+
+``` python
+fibonnaci_until_num(5) # 5
+fibonnaci_until_num(15) # 610
+```