ï..species when reading the csv file encoding

[Rafnuss]

Error when using flight_bird() on windows only

No match for 'Acrocephalus arundinaceus'. Please use the exact name. 
Closest matches are: 
[1] ï..species  wing_length secondary   mass       
<0 rows> (or 0-length row.names)
--- failed re-building 'wind-graph.Rmd'

Which comes from reading the csv file "avonet_clements.csv":

GeoPressureR/R/flight.R

Lines 38 to 40 in d7c6e91

	avonet <- utils::read.csv(system.file("extdata", "avonet_clements.csv",
	package = "GeoPressureR"
	))

This is apparently a common issue with UTF-8-BOM encoding.

[Rafnuss]

First tried to solved this with

GeoPressureR/R/flight.R

Lines 38 to 40 in 8b369bb

	avonet <- utils::read.csv(system.file("extdata", "avonet_clements.csv",
	package = "GeoPressureR", fileEncoding="UTF-8-BOM"
	))

But it didn't worked

Error in read.table(file = file, header = header, sep = sep, quote = quote,  : 
  no lines available in input
In addition: Warning message:
In file(file, "rt") :
  file("") only supports open = "w+" and open = "w+b": using the former

The second solution was to manually correct if afterward:

GeoPressureR/R/flight.R

Line 41 in b9b6f2d

colnames(avonet)[1] <- gsub('ï..','',colnames(avonet)[1])

But it wouldn't pass the check with the symbol, so resolved it by simply removing the character in GitHub editor directly: b9b6f2d