Trait `CacheableRepository` - `getCacheMinutes` method was removed without breaking version?

[coelsman]

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From version 2.7.7 to 2.7.9, method getCacheMinutes had been replaced by getCacheTime. As I investigated, the origin PR (#762) was marked as breaking changes, the released version must be 2.8 or whatever like that.

Follow new changes, I suggest:

• Keep origin getCacheMinutes method.
• Write new method called getCacheSeconds.
• Method getCacheTime: handle difference of ttl between Laravel version and call correspond method above.

[bsormagec]

I am open to PR about this @coelsman :)