README.md: add dependency protobuf

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Jörg Thalheim 2014-05-06 22:54:08 +02:00
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@ -126,7 +126,7 @@ You need [Go >=1.1](http://golang.org).
#### C/C++ libraries
Other dependencies are [libleveldb][], [libgeos][] and [libsqlite3][].
Other dependencies are [libleveldb][], [libgeos][], [protobuf][] and [libsqlite3][].
Imposm 3 was tested with recent versions of these libraries, but you might succeed with older versions.
GEOS >=3.2 is recommended, since it became much more robust when handling invalid geometries.
For best performance use [HyperLevelDB][libhyperleveldb] as an in-place replacement for libleveldb.