Rule not correct when using java options with a "+" .

[EkielZan]

Hi,
Small bug at the following line :

dockerfile_lint/config/default_rules.yaml

Line 185 in 15d5841

paramSyntaxRegex: /^[\w-$/\\=\"[\]{}@:,'`\t. ]+$/

When using a ENV like this :

ENV JAVA_OPTS -server -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap

the lint complain because of the "+".

Here is my proposed correction : (already using it myself)

/^[\w-$/+\="[]{}@:,'`\t. ]+$/