README.md in fluent-plugin-geoip-1.1.0 vs README.md in fluent-plugin-geoip-1.2.0

@@ -76,11 +76,11 @@
 
 before use, install dependent library as:
 
 ```bash
 # for RHEL/CentOS
-$ sudo yum group install "Development Tools"
+$ sudo yum groupinstall "Development Tools"
 $ sudo yum install geoip-devel --enablerepo=epel
 
 # for Ubuntu/Debian
 $ sudo apt-get install build-essential
 $ sudo apt-get install libgeoip-dev
@@ -115,11 +115,11 @@
 <filter access.apache>
   @type geoip
 
   # Specify one or more geoip lookup field which has ip address (default: host)
   # in the case of accessing nested value, delimit keys by dot like 'host.ip'.
-  geoip_lookup_key  host
+  geoip_lookup_keys host
 
   # Specify optional geoip database (using bundled GeoLiteCity databse by default)
   # geoip_database    "/path/to/your/GeoIPCity.dat"
   # Specify optional geoip2 database
   # geoip2_database   "/path/to/your/GeoLite2-City.mmdb" (using bundled GeoLite2-City.mmdb by default)
@@ -147,11 +147,11 @@
 #### Tips: how to geolocate multiple key
 
 ```xml
 <filter access.apache>
   @type geoip
-  geoip_lookup_key  user1_host, user2_host
+  geoip_lookup_keys user1_host, user2_host
   <record>
     user1_city      ${city.names.en["user1_host"]}
     user2_city      ${city.names.en["user2_host"]}
   </record>
 </filter>
@@ -162,11 +162,11 @@
 It is a sample to get friendly geo point recdords for elasticsearch with Yajl (JSON) parser.<br />
 
 ```
 <filter access.apache>
   @type                  geoip
-  geoip_lookup_key       host
+  geoip_lookup_keys      host
   <record>
     # lat lon as properties
     # ex. {"lat" => 37.4192008972168, "lon" => -122.05740356445312 }
     location_properties  '{ "lat" : ${location.latitude["host"]}, "lon" : ${location.longitude["host"]} }'
   
@@ -187,11 +187,11 @@
 On the case of using td-agent3 (v1-config), it have to quote `{ ... }` or `[ ... ]` block with quotation like below.
 
 ```
 <filter access.apache>
   @type                  geoip
-  geoip_lookup_key       host
+  geoip_lookup_keys      host
   <record>
     location_properties  '{ "lat" : ${location.latitude["host"]}, "lon" : ${location.longitude["host"]} }'
     location_string      ${location.latitude["host"]},${location.longitude["host"]}
     location_array       '[${location.longitude["host"]},${location.latitude["host"]}]'
   </record>
@@ -205,11 +205,11 @@
 <match access.apache>
   @type geoip
 
   # Specify one or more geoip lookup field which has ip address (default: host)
   # in the case of accessing nested value, delimit keys by dot like 'host.ip'.
-  geoip_lookup_key  host
+  geoip_lookup_keys host
 
   # Specify optional geoip database (using bundled GeoLiteCity databse by default)
   geoip_database    "/path/to/your/GeoIPCity.dat"
   # Specify optional geoip2 database
   # geoip2_database   "/path/to/your/GeoLite2-City.mmdb"
@@ -253,13 +253,14 @@
 ```xml
 <source>
   @type forward
 </source>
 
+
 <filter test.geoip>
   @type    geoip
-  geoip_lookup_key  host
+  geoip_lookup_keys  host
   <record>
     city  ${city.names.en["host"]}
     lat   ${location.latitude["host"]}
     lon   ${location.longitude["host"]}
   </record>
@@ -303,11 +304,11 @@
   <store>
     @type stdout
   </store>
   <store>
     @type    geoip
-    geoip_lookup_key  host
+    geoip_lookup_keys  host
     <record>
       lat     ${location.latitude["host"]}
       lon     ${location.longitude["host"]}
       country ${country.iso_code["host"]}
     </record>
@@ -436,16 +437,22 @@
 
 * Default value: bundled database `GeoLite2-City.mmdb`.
 
 Path to GeoIP2 database file.
 
-**geoip_lookup_key** (string) (optional)
+**geoip_lookup_keys** (array) (optional)
 
-* Default value: `host`.
+* Default_value: `["host"]`
 
 Specify one or more geoip lookup field which has IP address.
 
+**geoip_lookup_key** (string) (optional) (deprecated)
+
+* Default value: `nil`.
+
+Use geoip_lookup_keys instead.
+
 **skip_adding_null_record** (bool) (optional)
 
 * Default value: `nil`
 
 Skip adding geoip fields when this valaues to `true`.
@@ -487,14 +494,20 @@
 
 * Default value: bundled database `GeoLite2-City.mmdb`.
 
 Path to GeoIP2 database file.
 
-**geoip_lookup_key** (string) (optional)
+**geoip_lookup_keys** (array) (optional)
 
-* Default value: `host`.
+* Default value: `["host"]`
 
 Specify one or more geoip lookup field which has IP address.
+
+**geoip_lookup_key** (string) (optional) (deprecated)
+
+* Default value: `nil`.
+
+Use geoip_lookup_keys instead.
 
 **skip_adding_null_record** (bool) (optional)
 
 * Default value: `nil`