update CImg

Author: devernay

.appveyor.yml

@@ -86,9 +86,10 @@ install:
 
   # a3b57fe7f0cfbf84635e3070fc3c896b25ff6c5f is CImg 2.7.2
   # 3efdd8fb35e76873edcb01f9c30af762aeccb97a is CImg 2.7.4
+  # b7d35ed7dd03ff1ac58be4c10b365035454f3771 is CImg 2.8.1
   - git submodule -q update --init --recursive
-  - curl -L -s -S -o CImg/CImg.h https://raw.githubusercontent.com/dtschump/CImg/39215451d0b839b4e72d32afb15ea69701a7f4eb/CImg.h
-  - curl -L -s -S -o CImg/Inpaint/inpaint.h https://raw.githubusercontent.com/dtschump/CImg/39215451d0b839b4e72d32afb15ea69701a7f4eb/plugins/inpaint.h
+  - curl -L -s -S -o CImg/CImg.h https://raw.githubusercontent.com/dtschump/CImg/b7d35ed7dd03ff1ac58be4c10b365035454f3771/CImg.h
+  - curl -L -s -S -o CImg/Inpaint/inpaint.h https://raw.githubusercontent.com/dtschump/CImg/b7d35ed7dd03ff1ac58be4c10b365035454f3771/plugins/inpaint.h
   - patch -p0 -dCImg < CImg/Inpaint/inpaint.h.patch
 
 #---------------------------------#

CImg/Makefile

@@ -156,7 +156,8 @@ endif
 # commit a3b57fe7f0cfbf84635e3070fc3c896b25ff6c5f is CImg 2.7.2
 # commit 3efdd8fb35e76873edcb01f9c30af762aeccb97a is CImg 2.7.4
 # commit 39215451d0b839b4e72d32afb15ea69701a7f4eb is CImg 2.8.0
-CIMGVERSION=39215451d0b839b4e72d32afb15ea69701a7f4eb
+# commit b7d35ed7dd03ff1ac58be4c10b365035454f3771 is CImg 2.8.1
+CIMGVERSION=b7d35ed7dd03ff1ac58be4c10b365035454f3771
 
 CImg.h: Inpaint/inpaint.h
 	curl -L -s -S -o $@ https://raw.githubusercontent.com/dtschump/CImg/$(CIMGVERSION)/CImg.h