replace LazyLoad to LazyData

[hoxo-m]

LazyLoad is ignored since R 2.14.0.
https://cran.r-project.org/doc/manuals/r-release/R-exts.html#The-DESCRIPTION-file

The ‘LazyData’ logical field controls whether the R datasets use lazy-loading. A ‘LazyLoad’ field was used in versions prior to 2.14.0, but now is ignored.

[codecov-io]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #21   +/-   ##
=======================================
  Coverage   51.46%   51.46%           
=======================================
  Files          20       20           
  Lines        2110     2110           
=======================================
  Hits         1086     1086           
  Misses       1024     1024

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[rkillick]

Unfortunately I had to rebase the repository and lost this commit in doing so. Rather than me adding this myself I thought i'd give you the opportunity to resend the commit so you get credit.

Really sorry!

[hoxo-m]

Thanks for thinking about me. I will resend it.