feat: introduce BookRepository as abstraction of OpenLibrary (api-pla…

…tform#471)

chore: upgrade API Platform to 4.0.4 (api-platform#469)

chore: update api-platform to 4.0.3 (api-platform#454)

chore: update api-platform to 4.0.2 (api-platform#451)

chore: update api-platform to 4.0.1 (api-platform#450)

chore: use api-platform/symfony:^4.0 instead of api-platform/core (ap…

…i-platform#441)

chore: update api-platform/core to 3.4.0

chore: update api-platform/core to 3.3.13 (api-platform#447)

chore: update api-platform/core to 3.3.12 (api-platform#446)

chore: update api-platform/core 3.3.11 (api-platform#433)