More explicit message when caching a google font #441

Job	Run time
website / pkgdown	4m 31s
R-CMD-check / setup	14s
routine / routine	4m 59s
R-CMD-check / macOS-latest (4.3.3)	47s
R-CMD-check / windows-latest (devel)	10m 23s
R-CMD-check / windows-latest (4.3.3)	14m 19s
R-CMD-check / windows-latest (4.2)	13m 18s
R-CMD-check / windows-latest (4.1)	14m 31s
R-CMD-check / ubuntu-20.04 (devel)	7m 47s
R-CMD-check / ubuntu-20.04 (4.3.3)	6m 10s
R-CMD-check / ubuntu-20.04 (4.3.3)	6m 9s
R-CMD-check / ubuntu-20.04 (4.2.3)	6m 20s
R-CMD-check / ubuntu-20.04 (4.1.3)	6m 16s
R-CMD-check / ubuntu-20.04 (4.0.5)	6m 39s
	1h 42m 23s

Provide feedback