databases/py-aiomcache: Fix installation of tests files

- Tests files were installed to general directories
- Bump PORTREVISION

databases/py-aiomcache/Makefile

 PORTNAME=	aiomcache
 DISTVERSION=	0.7.0
+PORTREVISION=	1
 CATEGORIES=	databases python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -15,4 +16,7 @@ USES=		cpe python:3.7+
 CPE_VENDOR=	${PORTNAME}_project
 USE_PYTHON=	autoplist distutils cython
 
+post-extract:
+	@${MV} ${WRKSRC}/tests ${WRKSRC}/aiomcache/
+
 .include <bsd.port.mk>