Add rule discouraging instance_variable_get and instance_variable_set - #978

Add rule discouraging instance_variable_get and instance_variable_set#978

andyw8 wants to merge 2 commits into

rubocop:masterrubocop/ruby-style-guide:masterfrom

andyw8:no-dynamic-instance-variable-accessandyw8/ruby-style-guide:no-dynamic-instance-variable-accessCopy head branch name to clipboard