update dependency version constraints

[macbookandrew]

This allows installation with newer projects using a current version of composer/installers to resolve this error:

  Problem 1
    - stevegrunwell/wp-cache-remember v1.1.0 requires composer/installers ^1.5 -> found composer/installers[v1.5.0, ..., v1.12.0] but the package is fixed to v2.0.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
    - stevegrunwell/wp-cache-remember v1.1.1 requires composer/installers ^1.0 -> found composer/installers[v1.0.0, ..., v1.12.0] but the package is fixed to v2.0.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
    - Root composer.json requires stevegrunwell/wp-cache-remember ^1.1 -> satisfiable by stevegrunwell/wp-cache-remember[v1.1.0, v1.1.1].

[stevegrunwell]

Thank you!