fix dependence error for pdfminer3k

[shouhuanxiaoji]

fix follow error: Collecting pdfminer3k==1.3.1 (from -r requirements.txt (line 3)) Could not find a version that satisfies the requirement pdfminer3k==1.3.1 (from -r requirements.txt (line 3)) (from versions: 1.3.2, 1.3.3, 1.3.4)
No matching distribution found for pdfminer3k==1.3.1 (from -r requirements.txt (line 3))