README.adoc: add a Star History Chart badge/image #250

Job	Run time
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, no)	4m 53s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-1.0)	5m 26s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-0.1)	5m 14s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, no)	5m 22s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-1.0)	5m 9s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-0.1)	5m 8s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, no)	4m 45s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-1.0)	5m 0s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-0.1)	5m 7s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, no)	6m 56s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-1.0)	4m 49s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-0.1)	5m 1s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, no)	5m 15s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-1.0)	5m 27s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-0.1)	5m 11s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, no)	4m 53s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-1.0)	5m 54s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-0.1)	5m 6s
Analyze (python, ubuntu-latest, PYTHON=python3, no, no)	1m 16s
	1h 35m 52s

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