Add contributors

Added @higgi13425  as a contributor for his much needed documentation editing!
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+Package: posterdown
+Title: Generates PDF conference posters using R Markdown.
+Version: 0.1.1
+Author: Brent Thorne
+Description: Posterdown expands on RMarkdown to generate PDF conference posters.
+Authors@R: c(
+    person("Brent", "Thorne",
+           email = "brent.thorne18@gmail.com", 
+           role = c("aut", "cre"), 
+           comment = c(ORCID = "0000-0002-1099-3857")
+    ),
+    person("Peter", "Higgins", role = "ctb")
+  )
+Maintainer: Brent Thorne <brent.thorne18@gmail.com>
+License: MIT + file LICENSE
+Encoding: UTF-8
+LazyData: true
+URL: https://github.com/brentthorne/posterdown
+BugReports: https://github.com/brentthorne/posterdown/issues
+Imports: rmarkdown, knitr, yaml, tinytex, ggplot2, rticles, kableExtra, Cairo
+SystemRequirements: GNU make
+RoxygenNote: 6.1.1