fhem, freifunk, impfee, matemat: use open-uri properly

fhem/scrape.rb

@@ -10,7 +10,7 @@ PASSWORD = ARGV[2]
 
 points = []
 
-doc = Nokogiri::HTML open("https://#{HOST}/fhem?room=all", :http_basic_authentication => [USER, PASSWORD])
+doc = Nokogiri::HTML URI::open("https://#{HOST}/fhem?room=all", :http_basic_authentication => [USER, PASSWORD])
 doc.css('.roomoverview tr').each do |row|
   name = row.css('.col1').text
   current = row.css('.col2').text

freifunk_node/scrape.rb

@@ -7,7 +7,7 @@ require 'influxdb'
 
 HOST = ARGV[0]
 
-data = JSON.parse open("http://#{HOST}/sysinfo-json.cgi").read()
+data = JSON.parse URI::open("http://#{HOST}/sysinfo-json.cgi").read()
 
 $node_id = data['data']['common']['node']
 $node_name = URI::decode(data['data']['contact']['name'])

impfee/scrape.rb

@@ -5,13 +5,13 @@ require 'json'
 require 'influxdb'
 
 # https://www.countee.ch/app/de/counter/impfee/_iz_sachsen
-data = JSON.parse open("https://www.startupuniverse.ch/api/1.1/de/counters/getAll/_iz_sachsen").read()
+data = JSON.parse URI::open("https://www.startupuniverse.ch/api/1.1/de/counters/getAll/_iz_sachsen").read()
 
 points = []
 data['response']['data'].each do |id, iz|
   next if iz['closed'] != 0
   sum = iz['counteritems'].map { |item| item['val'] }.sum
-  
+
   points.push({
                 series: "iz",
                 tags: {

matemat/scrape.rb

@@ -10,13 +10,13 @@ PASSWORD = ARGV[2]
 
 points = []
 
-data = JSON.parse open("https://#{HOST}/statistics.json", :http_basic_authentication => [USER, PASSWORD]).read()
+data = JSON.parse URI::open("https://#{HOST}/statistics.json", :http_basic_authentication => [USER, PASSWORD]).read()
 points.push({
   series: 'statistics',
   values: data.map { |(n, i)| [n, i.to_i] },
 })
 
-data = JSON.parse open("http://#{HOST}/summary.json", :http_basic_authentication => [USER, PASSWORD]).read()
+data = JSON.parse URI::open("https://#{HOST}/summary.json", :http_basic_authentication => [USER, PASSWORD]).read()
 data.each do |d|
   points.push({
     series: 'summary',