Replace deprecated ${var} string interpolation with {$var} interpolation #228
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Although #216 was closed and fixed by 9bd2cd7, suppressing the deprecation errors is not a solution when gordalina/cachetool is used as a library in projects where error reporting is desired.
This PR replaces the deprecated ${var} string interpolation with {$var} interpolation. As I couldn't figure out the preferred way to build strings for this project, because string concatenation and sprintf are also used, I went ahead and kept this change as small as possible.