Added new flag for QR2

qr-2/description.md

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+When I am not practicing my [Oboe](https://en.wikipedia.org/wiki/Oboe) for band, I have been working on a QR code generator. For some reason, some of the images are not scannable. [Here](${qr2_1_bmp}) is one, can you tell me what it says?

qr-2/grader.py

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+def grade(autogen, answer):
+    if answer.find("w0w_who_kn3w_that_Oboes_c0uld_mask_a_s3cr3t?") != -1:
+        return True, "Congrats!"
+    return False, "Nope, try again."

qr-2/problem.yml

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+title: QR 2
+author: wiresboy
+category: Forensics
+autogen: false
+programming: false
+value: 330
+hint: Is there another kind of Oboe?
+files:
+  - qr2_1.bmp