Update README.md

README.md

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 While developing this package, I stick to following principles
 
-* Succinct: The code is extremely terse. Minimizing the number of lines is a primal target. As a result, the core of the algorithms can be easily spot.
+* Succinct: The code is extremely terse. Minimizing the number of lines is one of the primal goals. As a result, the core of the algorithms can be easily spot.
 * Efficient: Many tricks for making Matlab scripts fast were applied (eg. vectorization and matrix factorization). Many functions are even comparable with C implementations. Usually, functions in this package are orders faster than Matlab builtin ones which provide the same functionality (eg. kmeans). If anyone have found any Matlab implementation that is faster than mine, I am happy to further optimize.
 * Robust: Many tricks for numerical stability are applied, such as probability computation in log scale and square root matrix update to enforce matrix symmetry, etc.
 * Readable: The code is heavily commented. Reference formulas in PRML book are indicated for corresponding code lines. Symbols are in sync with the book.