Fix regex for double-digit numbers

Makefile

@@ -80,15 +80,15 @@ po2json:
 
 .PHONY: release
 release:
-	sed -i s/Version:\ [0-9]\.[0-9]\.[0-9]/Version:\ $(VERSION)/ src/converse.js
-	sed -i s/Project-Id-Version:\ Converse\.js\ [0-9]\.[0-9]\.[0-9]/Project-Id-Version:\ Converse.js\ $(VERSION)/ locale/converse.pot
-	sed -i s/\"version\":\ \"[0-9]\.[0-9]\.[0-9]\"/\"version\":\ \"$(VERSION)\"/ bower.json
-	sed -i s/\"version\":\ \"[0-9]\.[0-9]\.[0-9]\"/\"version\":\ \"$(VERSION)\"/ package.json
-	sed -i s/--package-version=[0-9]\.[0-9]\.[0-9]/--package-version=$(VERSION)/ Makefile
-	sed -i s/v[0-9]\.[0-9]\.[0-9]\.zip/v$(VERSION)\.zip/ index.html
-	sed -i s/v[0-9]\.[0-9]\.[0-9]\.tar\.gz/v$(VERSION)\.tar\.gz/ index.html
-	sed -i s/version\ =\ \'[0-9]\.[0-9]\.[0-9]\'/version\ =\ \'$(VERSION)\'/ docs/source/conf.py
-	sed -i s/release\ =\ \'[0-9]\.[0-9]\.[0-9]\'/release\ =\ \'$(VERSION)\'/ docs/source/conf.py
+	sed -i s/Version:\ [0-9]\+\.[0-9]\+\.[0-9]\+/Version:\ $(VERSION)/ src/converse.js
+	sed -i s/Project-Id-Version:\ Converse\.js\ [0-9]\+\.[0-9]\+\.[0-9]\+/Project-Id-Version:\ Converse.js\ $(VERSION)/ locale/converse.pot
+	sed -i s/\"version\":\ \"[0-9]\+\.[0-9]\+\.[0-9]\+\"/\"version\":\ \"$(VERSION)\"/ bower.json
+	sed -i s/\"version\":\ \"[0-9]\+\.[0-9]\+\.[0-9]\+\"/\"version\":\ \"$(VERSION)\"/ package.json
+	sed -i s/--package-version=[0-9]\+\.[0-9]\+\.[0-9]\+/--package-version=$(VERSION)/ Makefile
+	sed -i s/v[0-9]\+\.[0-9]\+\.[0-9]\+\.zip/v$(VERSION)\.zip/ index.html
+	sed -i s/v[0-9]\+\.[0-9]\+\.[0-9]\+\.tar\.gz/v$(VERSION)\.tar\.gz/ index.html
+	sed -i s/version\ =\ \'[0-9]\+\.[0-9]\+\.[0-9]\+\'/version\ =\ \'$(VERSION)\'/ docs/source/conf.py
+	sed -i s/release\ =\ \'[0-9]\+\.[0-9]\+\.[0-9]\+\'/release\ =\ \'$(VERSION)\'/ docs/source/conf.py
 	sed -i "s/(Unreleased)/(`date +%Y-%m-%d`)/" docs/CHANGES.md
 	make pot
 	make po