Corrected typo in README.txt
Corrected typo in README.txt

hgomersall/pyFFTW,simudream/pyFFTW,frederikhermans/pyfftw-arm,jonathanessen/pyFFTW,simudream/pyFFTW,hgomersall/pyFFTW,drwells/pyFFTW,hgomersall/pyFFTW,drwells/pyFFTW,simudream/pyFFTW,frederikhermans/pyfftw-arm,jonathanessen/pyFFTW,drwells/pyFFTW,simudream/pyFFTW,drwells/pyFFTW,jonathanessen/pyFFTW