Fix Documentation contains '&lt' which is not rendered

Correct: get_GSOD.R:83--85: Documentation contains '&lt' which is not
rendered as a less than symbol in the html documentation.

Suggested by jefferyhanson

R/get_GSOD.R

@@ -80,10 +80,10 @@
 #' Air Force Navy" number - with WBAN being the acronym}
 #' \item{STN_NAME}{Unique text identifier}
 #' \item{CTRY}{Country in which the station is located}
-#' \item{LAT}{Latitude. *Station dropped in cases where values are <-90 or
-#' >90 degrees or Lat = 0 and Lon = 0*}
-#' \item{LON}{Longitude. *Station dropped in cases where values are <-180 or
-#'>180 degrees or Lat = 0 and Lon = 0*}
+#' \item{LAT}{Latitude. *Station dropped in cases where values are < -90 or
+#'> 90 degrees or Lat = 0 and Lon = 0*}
+#' \item{LON}{Longitude. *Station dropped in cases where values are < -180 or
+#'> 180 degrees or Lat = 0 and Lon = 0*}
 #' \item{ELEV_M}{Elevation in metres}
 #' \item{ELEV_M_SRTM_90m}{Elevation in metres corrected for possible errors,
 #' derived from the CGIAR-CSI SRTM 90m database (Jarvis et al. 2008)}