this updates i2p to the latest version

unfortunately, they did not publish a release/tag on GitHub and two
weeks after I filled an issue about it
https://github.com/i2p/i2p.i2p/issues/78
I got no reply and there are still no tag done, so this patch switch
to their official mirror instead of GitHub

heavily tested on 7.5 and -current, works fine

diff --git a/net/i2p/Makefile b/net/i2p/Makefile
index f8765fb1a4c..72530bb18a4 100644
--- a/net/i2p/Makefile
+++ b/net/i2p/Makefile
@@ -1,9 +1,8 @@
 COMMENT=	i2p routing protocol
 
-GH_ACCOUNT=	i2p
-GH_PROJECT=	i2p.i2p
-GH_TAGNAME=	i2p-2.5.1
-DISTNAME=	${GH_TAGNAME}
+V =		2.5.2
+DISTNAME =	i2psource_${V}
+PKGNAME =	i2p-${V}
 
 CATEGORIES=	net
 
@@ -15,8 +14,12 @@ MAINTAINER=	Pascal Stumpf <pascal@stumpf.co>
 # EPLv1.0 GPLv2 GPLv3 LGPLv2.1 LGPLv3 MIT public-domain WTFPLv2
 PERMIT_PACKAGE=	Yes
 
+EXTRACT_SUFX =	.tar.bz2
+
 WANTLIB +=	gmp
 
+SITES =		https://files.i2p-projekt.de/${V}/
+
 MODULES=	java
 MODJAVA_VER=	1.8
 MODJAVA_BUILD=	ant
@@ -48,6 +51,8 @@ MAKE_ENV=	CC=${CC} BITS=${BITS} MACHINE_ARCH=${MACHINE_ARCH}
 # test requires addition dependencies (atleast: junit, hamcrest, jmockfit)
 NO_TEST=	Yes
 
+WRKDIST=	${WRKDIR}/i2p-${V}
+
 post-patch:
 	${SUBST_CMD} ${WRKSRC}/installer/resources/wrapper.config
 	${SUBST_CMD} ${WRKSRC}/installer/resources/i2prouter
diff --git a/net/i2p/distinfo b/net/i2p/distinfo
index 51c78797fb6..0141daa6cb3 100644
--- a/net/i2p/distinfo
+++ b/net/i2p/distinfo
@@ -1,2 +1,2 @@
-SHA256 (i2p-2.5.1.tar.gz) = 0gluxFWJoi4IDhibrAPQkuIDe0qg7615Xs0NFhoTaIw=
-SIZE (i2p-2.5.1.tar.gz) = 38419885
+SHA256 (i2psource_2.5.2.tar.bz2) = 8j0HRtcqVczL0X9Adi5JGuG0LN9V1+c0BNITqEmFynM=
+SIZE (i2psource_2.5.2.tar.bz2) = 33791390