Add new snippet: Half quoted triple strings

Closes https://github.com/satwikkansal/wtfpython/issues/40

README.md

@@ -1774,6 +1774,26 @@ a, b = a[b] = {}, 5
      print(dis.dis(f))
      ```
 
+* Half triple-quoted strings (suggested by @asottile in [this](https://github.com/satwikkansal/wtfpython/issues/40) issue).
+  ```py
+  >>> print('wtfpython''')
+  wtfpython
+  >>> print("wtfpython""")
+  wtfpython
+  >>> # The following statements raise `SyntaxError`
+  >>> # print('''wtfpython')
+  >>> # print("""wtfpython")
+  ```
+  **💡 Explanation:**
+  + Python support implicit [string literal concatenation](https://docs.python.org/2/reference/lexical_analysis.html#string-literal-concatenation), Example,
+    ```
+    >>> print("wtf" "python")
+    wtfpython
+    >>> print("wtf" "") # or "wtf"""
+    wtf
+    ```
+  + `'''` and `"""` are also string delimiters in Python which causes a SyntaxError because the Python interpreter was expecting a terminating triple quote as delimiter while scanning the currently encountered triple quoted string literal.
+
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