Modify README

README

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  About SMASH
  -----------
  Scalable Molecular Analysis Solver for High-performance computing systems 
- (SMASH) is massively parallel software for quantum chemistry calculations
- and released under the Apache 2.0 open source license. It is currently
+ (SMASH) is massively parallel open-source software for quantum chemistry
+ It is released under the Apache 2.0 open source license, and is currently
  capable of energy, analytical gradient, and geometry optimization
  calculations of Hartree-Fock theory, Density Functional Theory (DFT), and
  Second-order Moller-Plesset (MP2) perturbation theory. DFT calculations
- can be performed on 100,000 CPU cores of K Computer with high parallel
- efficiency. The Fortran 90/95 language is used with MPI and OpenMP for
- inter-node and intra-node parallelization, respectively. Supported
- platforms are x86-64/Linux with Intel, NVIDIA HPC SDK (ex-PGI), or GNU 
- compilers, and Supercomputer Fugaku and FX1000/700 with Fujitsu compiler.
+ can be performed on 100,000 CPU cores with high parallel efficiency.
+ The Fortran 90/95 language is used with MPI and OpenMP for inter-node and
+ intra-node parallelization, respectively. Supported platforms are
+ x86-64/Linux with Intel, NVIDIA HPC SDK (ex-PGI), or GNU compilers, and
+ Supercomputer Fugaku and FX1000/700 with Fujitsu compiler.
 
  Documentation
  -------------