Fixed copy of headers to include .hpp files.

.travis.yml

@@ -10,7 +10,4 @@ before_install:
 script:
   - _mocha -R spec integration/regtest.js
   - _mocha -R spec --recursive
-cache:
-  directories:
-    - platform/ubuntu
 

bin/build-libbitcoind

@@ -16,7 +16,7 @@ copy_header_files () {
   if [[ -d "${artifacts_dir}" && -d "${h_and_a_dir}" && -d "${btc_dir}" ]]; then
     mkdir -p "${artifacts_dir}/include" > /dev/null 2>&1
     pushd "${root_dir}"
-    find libbitcoind -name \*.h -print0 | xargs -0 -I{} rsync -R {} "${artifacts_dir}"/include
+    find libbitcoind -type f \( -name "*.h" -or -name "*.hpp" \) -print0 | xargs -0 -I{} rsync -R {} "${artifacts_dir}"/include
     popd
   fi
 }