Merge pull request ARMmbed#2 from Origem-Motos/fix/pyelftools_version

fix: pyelftools max version set to be 0.29

Author: VelosoCitor

requirements.txt

@@ -16,7 +16,7 @@ mbed-ls>=1.5.1,<1.8
 mbed-host-tests>=1.4.4,<1.6
 mbed-greentea>=0.2.24,<1.8
 beautifulsoup4>=4,<=4.6.3
-pyelftools>=0.27,<1
+pyelftools>=0.27,<=0.29
 manifest-tool==1.5.2
 icetea>=1.2.1,<1.3
 pycryptodome>=3.7.2,<=3.7.3