fix ruby version parser for rvm

fix ruby version check parser for rvm

check_eol-versiondetect/detect-ruby

@@ -12,4 +12,12 @@
 #   ruby --version
 #   ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
 
-ruby --version | cut -b 6-8
+#    rvm list
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+#    =* ruby-2.6.3 [ x86_64 ]
+
+#    #=> - current
+#    #=* - current && default
+#    # * - default
+
+
+rvm list | grep ^= | cut -f 2 -d " " | cut -f 2 -d "-" || ruby --version
\ No newline at end of file