Update README.md

Author: masa16

fft/README.md

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-# Ruby wrapper of FFT
+# Ruby wrapper of Ooura's FFT
 
-## FFT
+## Ooura's FFT package
 * General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package
-* Author: Takuya OOURA
+* Author: Dr. Takuya OOURA
 * Visit [web site](http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html)
 
 ## Ruby wrapper