Fix the spdx-tools conflict issue (#115)

Signed-off-by: Jiyeong Seok <[email protected]>

Author: dd-jy

requirements.txt

@@ -9,4 +9,4 @@ coloredlogs
 python3-wget
 beautifulsoup4
 jsonmerge
-spdx-tools
+spdx-tools==0.7.0a3

src/fosslight_util/write_spdx.py

@@ -12,7 +12,7 @@
 from spdx.document import Document
 from spdx.package import Package
 from spdx.relationship import Relationship
-from spdx.license import License
+from spdx.document import License
 from spdx.utils import SPDXNone
 from spdx.utils import NoAssert
 from spdx.version import Version