Added link to source data

Pandas in the wild.ipynb

@@ -70,7 +70,11 @@
    "source": [
     "# How much money did the agency spend?\n",
     "\n",
-    "Let's try and answer a basic question -- how much money did this agency pay to vendors? Hopefully that'll be simeple to answer.\n",
+    "Let's get some data try and answer a basic question.\n",
+    "\n",
+    "The data I'll use is quasi-public agency spending data available here (http://www.osc.ct.gov/openCT/quasi.html), specifically for the CT Airport Authority (https://data.ct.gov/dataset/Connecticut-Airport-Authority-Financial-Data-FY-15/tw3a-jmn4)\n",
+    "\n",
+    "how much money did this agency pay to vendors? Hopefully that'll be simeple to answer.\n",
     "\n",
     "NOTE: THIS EXAMPLE ANALYSIS IS FOR TECHNICAL INSTRUCTION ONLY. I haven't used this data in a story or verified with its creator what exactly is and isn't included in the data, or how it's structured. When we sum up the total payments, that's not a meaningful number until we understand the answers to questions like: What expenses are and aren't in this table? Are any expenses in there more than once, like if a check was written, cancelled, and then rewritten? Some records have the same Voucher Number -- why is that?"
    ]