update links for v0.99.1 release

src/40_install.pod

@@ -181,20 +181,20 @@ for our system.  Let's download the rootfs into this directory so we
 won't pollute LiveCD RAM:
 
     # cd /mnt
-    # wget -c https://github.com/zeppe-lin/pkgsrc-core/releases/download/v0.99/rootfs-v0.99-x86_64.tar.xz{,.sig}
+    # wget -c https://github.com/zeppe-lin/pkgsrc-core/releases/download/v0.99.1/rootfs-v0.99.1-x86_64.tar.xz{,.sig}
 
 =head4 I<Signature verification>
 
 It's optional but highly recommended to verify rootfs signature:
 
     # gpg --keyserver keyserver.ubuntu.com --recv-keys 59ec1986fbd902cf
-    # gpg --verify rootfs-v0.99-x86_64.tar.xz.sig rootfs-v0.99-x86_64.tar.xz
+    # gpg --verify rootfs-v0.99.1-x86_64.tar.xz.sig rootfs-v0.99.1-x86_64.tar.xz
 
 =head3 B<Extract rootfs tarball>
 
 If everything is OK, let's unpack the tarball:
 
-    # tar -xvf rootfs-v0.99-x86_64.tar.xz -C .
+    # tar -xvf rootfs-v0.99.1-x86_64.tar.xz -C .
 
 =head3 B<Chroot>