src/Makefile: Reword "to run make test" message
src/Makefile: Reword "to run make test" message

Closes #1610

xuzhezhaozhao/redis_reading,splitice/redis,ttuna/msot-redis,ttuna/msot-redis,himoca/redis,ksarch-saas/redis,darksideofthemoo/redis-histogram,HunanTV/redis,xuzhezhaozhao/redis_reading,spearhead-ea/redis,slfs007/mk-redis,himoca/redis,slfs007/mk-redis,ksarch-saas/redis,MSOpenTech/redis,louisliangjun/redis,ttuna/msot-redis,darksideofthemoo/redis-histogram,MSOpenTech/redis,MSOpenTech/redis,ksarch-saas/redis,louisliangjun/redis,HunanTV/redis,darksideofthemoo/redis-histogram,ttuna/msot-redis,louisliangjun/redis,spearhead-ea/redis,spearhead-ea/redis,ksarch-saas/redis,splitice/redis,maodeyi/redis_lua,MSOpenTech/redis,MSOpenTech/redis,splitice/redis,louisliangjun/redis,splitice/redis,maodeyi/redis_lua,xuzhezhaozhao/redis_reading,ttuna/msot-redis,xuzhezhaozhao/redis_reading,darksideofthemoo/redis-histogram,jxwr/redis,slfs007/mk-redis,maodeyi/redis_lua,jxwr/redis,ramonsnir/redis,ramonsnir/redis,jxwr/redis,ramonsnir/redis,HunanTV/redis,himoca/redis,HunanTV/redis