Merge pull request #540 from swahtz/fix/cie_1931_2deg_ybar_547nm

Fix a typo at ȳ(547 nm) in CIE 1931 2° observer table

Author: mmp

src/pbrt/util/spectrum.cpp

@@ -403,7 +403,7 @@ const Float CIE_Y[nCIESamples] = {
     0.8620000,       0.8738108,       0.8849624,       0.8954936,       0.9054432,
     0.9148501,       0.9237348,       0.9320924,       0.9399226,       0.9472252,
     0.9540000,       0.9602561,       0.9660074,       0.9712606,       0.9760225,
-    0.9803000,       0.9840924,       0.9874812,       0.9903128,       0.9928116,
+    0.9803000,       0.9840924,       0.9874182,       0.9903128,       0.9928116,
     0.9949501,       0.9967108,       0.9980983,       0.9991120,       0.9997482,
     1.0000000,       0.9998567,       0.9993046,       0.9983255,       0.9968987,
     0.9950000,       0.9926005,       0.9897426,       0.9864444,       0.9827241,