Fix platform_version attribute name

Author: Jef Spaleta

Diff for: .bonsai.yml

@@ -9,7 +9,7 @@ builds:
   -  "entity.system.os == 'linux'"
   -  "entity.system.arch == 'amd64'"
   -  "entity.system.platform == 'alpine'"
-  -  "entity.system.platform_release.split('.')[0] == '3'"
+  -  "entity.system.platform_version.split('.')[0] == '3'"
 - platform: "alpine3.8"
   arch: "amd64"
   asset_filename: "#{repo}_#{version}_ruby-2.4.4_alpine3.8_linux_amd64.tar.gz"
@@ -34,7 +34,7 @@ builds:
   -  "entity.system.os == 'linux'"
   -  "entity.system.arch == 'amd64'"
   -  "entity.system.platform_family == 'rhel'"
-  -  "entity.system.platform_release.split('.')[0] == '6'"
+  -  "entity.system.platform_version.split('.')[0] == '6'"
 - platform: "centos7"
   arch: "amd64"
   asset_filename: "#{repo}_#{version}_ruby-2.4.4_centos7_linux_amd64.tar.gz"
@@ -43,7 +43,7 @@ builds:
   -  "entity.system.os == 'linux'"
   -  "entity.system.arch == 'amd64'"
   -  "entity.system.platform_family == 'rhel'"
-  -  "entity.system.platform_release.split('.')[0] == '7'"
+  -  "entity.system.platform_version.split('.')[0] == '7'"
 - platform: "debian"
   arch: "amd64"
   asset_filename: "#{repo}_#{version}_ruby-2.4.4_debian_linux_amd64.tar.gz"
@@ -60,4 +60,4 @@ builds:
   -  "entity.system.os == 'linux'"
   -  "entity.system.arch == 'amd64'"
   -  "entity.system.platform_family == 'debian'"
-  -  "entity.system.platform_release.split('.')[0] == '9'"
+  -  "entity.system.platform_version.split('.')[0] == '9'"