pGPx 0.1.4

• Updated package overview help file to comply with breaking change in roxygen 7.0.0.

• Updated NEWS.md to standard format.

pGPx 0.1.3

• Removed C++11 requirement to fix NOTES in CRAN checks

• Added CRAN badge to readme file

pGPx 0.1.2

• fixed a major malloc bug in dt.h

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