fix header in challenge question 7

Author: pssachdeva

lessons/01_python_data_wrangling.ipynb

@@ -565,7 +565,7 @@
    "source": [
     "---\n",
     "\n",
-    "### Challenge 7: Another Way to Obtain the Month\n",
+    "### Challenge 7: Another Way to Obtain the Year\n",
     "\n",
     "If you didn't know that casting floats to ints truncates the decimals in Python, you could have used NumPy's `floor()` function. `np.floor` takes an array or `pd.Series` of floats as its argument, and returns an array or `pd.Series` where every float has been rounded down to the nearest whole number. \n",
     "\n",

solutions/01_python_data_wrangling_solutions.ipynb

@@ -340,7 +340,7 @@
    "source": [
     "---\n",
     "\n",
-    "### Challenge 7: Another Way to Obtain the Month\n",
+    "### Challenge 7: Another Way to Obtain the Year\n",
     "\n",
     "If you didn't know that casting floats to ints truncates the decimals in Python, you could have used NumPy's `floor()` function. `np.floor` takes an array or `pd.Series` of floats as its argument, and returns an array or `pd.Series` where every float has been rounded down to the nearest whole number. \n",
     "\n",