Upgrade images in .drone.yml to more recent versions (#4819)

.drone.yml

       branch: [ master ]
 
   update-translations:
-    image: alpine:3.6
+    image: alpine:3.7
     commands:
       - mv ./options/locale/locale_en-US.ini ./options/
       - sed -i -e 's/="/=/g' -e 's/"$$//g' ./options/locale/*.ini
       event: [ push, tag, pull_request ]
 
   build:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     environment:
       TAGS: bindata sqlite
       event: [ push, tag, pull_request ]
 
   test:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
       branch: [ master ]
 
   test:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
       branch: [ release/* ]
 
   test:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
   #     event: [ push, tag, pull_request ]
 
   test-mysql:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
       branch: [ master ]
 
   test-mysql:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
       event: [ tag ]
 
   test-pgsql:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     group: test
     environment:
       event: [ push, tag, pull_request ]
 
   generate-coverage:
-    image: golang:1.10
+    image: golang:1.11
     pull: true
     environment:
       TAGS: bindata

modules/markup/html.go

 ) ([]byte, error) {
 	// create the context from the parameters
 	ctx := &postProcessCtx{
-		metas:          metas,
-		urlPrefix:      urlPrefix,
-		isWikiMarkdown: isWikiMarkdown,
-		procs:          defaultProcessors,
+		metas:                   metas,
+		urlPrefix:               urlPrefix,
+		isWikiMarkdown:          isWikiMarkdown,
+		procs:                   defaultProcessors,
 		visitLinksForShortLinks: true,
 	}
 	return ctx.postProcess(rawHTML)

modules/templates/helper.go

 			}
 			return str[start:end]
 		},
-		"EllipsisString":    base.EllipsisString,
-		"DiffTypeToStr":     DiffTypeToStr,
-		"DiffLineTypeToStr": DiffLineTypeToStr,
-		"Sha1":              Sha1,
-		"ShortSha":          base.ShortSha,
-		"MD5":               base.EncodeMD5,
+		"EllipsisString":        base.EllipsisString,
+		"DiffTypeToStr":         DiffTypeToStr,
+		"DiffLineTypeToStr":     DiffLineTypeToStr,
+		"Sha1":                  Sha1,
+		"ShortSha":              base.ShortSha,
+		"MD5":                   base.EncodeMD5,
 		"ActionContent2Commits": ActionContent2Commits,
 		"PathEscape":            url.PathEscape,
 		"EscapePound": func(str string) string {