update boost download address

gcontini

2020-10-10 fc059acc0101b45b91be98256289c4060df8e30e

 src/library/base/CMakeLists.txt

@@ -1,7 +1,7 @@
ADD_LIBRARY(base OBJECT
    EventRegistry.cpp
    StringUtils.cpp
    file_utils.cpp
    string_utils.cpp
    base64.cpp
    logger.cpp
)