remove trailing whitespaces

build/cmake_modules/FindMiniUPnPc.cmake

@@ -24,5 +24,5 @@ else()
   endif()
 
   mark_as_advanced(MINIUPNPC_INCLUDE_DIR MINIUPNPC_LIBRARY)
-  
+
 endif()

build/docker/old-ubuntu-based/Dockerfile

@@ -5,7 +5,7 @@ RUN apt-get update && apt-get install -y libboost-dev libboost-filesystem-dev \
        libssl-dev git build-essential
 
 RUN git clone https://github.com/PurpleI2P/i2pd.git
-WORKDIR /i2pd 
+WORKDIR /i2pd
 RUN make
 
 CMD ./i2pd