Update ds18b20 and move ds18b20 and sht20 into modules folder

guowenxue

2018-10-14 0007a0beea36408539e623d742787c38c03b5c80

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INST_PATH=/usr/bin
BIN_NAME=ds18b20
 
all: 
    gcc ds18b20.c -o ${BIN_NAME}
 
clean: 
    rm -f ${BIN_NAME}
 
install: 
    @cp ${BIN_NAME} ${INST_PATH}