[docker] Remove pinned versions

Dockerfile

@@ -12,19 +12,19 @@ RUN mkdir -p /usr/share/man/man1 && \
 	apt-get update && \
 	apt-get install  --yes --no-install-recommends \
 	# Install gnupg for the apt-key operation
-	gnupg=2.2.12-1+deb10u1 \
+	gnupg \
 	# libssl for faster TLS in Crystal
-	libssl-dev=1.1.1d-0+deb10u2 \
+	libssl-dev \
 	# pdftk as a dependency for muse-dl
 	pdftk=2.02-5 \
 	# ca-certificates for talking to crystal-lang.org
-	ca-certificates=20190110 \
+	ca-certificates \
 	# git to let shards install happen
-	git=1:2.20.1-2+deb10u1 \
+	git \
 	# needed by myhtml crystal shard
-	make=4.2.1-1.2 \
+	make \
 	# build --release
-	zlib1g-dev=1:1.2.11.dfsg-1 && \
+	zlib1g-dev && \
 	# See https://crystal-lang.org/install/
 	apt-key add /tmp/crystal.gpg && \
 	echo "deb https://dist.crystal-lang.org/apt crystal main" > /etc/apt/sources.list.d/crystal.list && \

README.md

@@ -66,6 +66,7 @@ INPUT_FILE: Path to a file containing a list of links
     --no-bookmarks                   Don't add bookmarks in the PDF
     --input-pdf INPUT                Input Stitched PDF. Will not download anything
     --clobber                        Overwrite the output file, if it already exists. Not compatible with input-pdf
+    --dont-strip-first-page          Disables first page from being stripped. Use carefully
     --cookie COOKIE                  Cookie-header
     -h, --help                       Show this help
 ```