fix readme and grover example

Author: dakk

README.md

@@ -11,9 +11,13 @@ This tool will be useful for any algorithm that relies on a 'blackbox' function
 
 Qlasskit implements circuit / gate exporters for Qiskit, Cirq, Qasm and Sympy.
 
-
+```bash
+pip install qlasskit
+```
 
 ```python
+from qlasskit import qlassf, Qint4 
+
 @qlassf
 def h(k: Qint4) -> bool:
     h = True

docs/source/example_grover_hash.ipynb

@@ -37,7 +37,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -49,13 +49,10 @@
     }
    ],
    "source": [
-    "d = {}\n",
-    "for x in range(2**4):\n",
-    "    for y in range(2**4):\n",
-    "            v = hex(hash_simp.original_f((x,y)))\n",
-    "            if v not in d:\n",
-    "                d[v] = 0\n",
-    "            d[v] += 1\n",
+    "from collections import Counter\n",
+    "\n",
+    "d = Counter(hex(hash_simp.original_f((x, y))) for x in range(2**4) for y in range(2**4))\n",
+    "\n",
     "print('Hash function output space:', len(d))"
    ]
   },