Bump to v0.2.7 (#1561)

## Issue Addressed

NA

## Proposed Changes

- Update to v0.2.7
- Add script to make update easy.

## Additional Info

NA

scripts/change_version.sh

@@ -0,0 +1,32 @@
+# Change the version across multiple files, prior to a release. Use `sed` to
+# find/replace the exiting version with the new one.
+#
+# Takes two arguments:
+#
+# 1. Current version (e.g., `0.2.6`)
+# 2. New version (e.g., `0.2.7`)
+#
+# ## Example:
+#
+# `./change_version.sh 0.2.6 0.2.7`
+
+FROM=$1
+TO=$2
+VERSION_CRATE="../common/lighthouse_version/src/lib.rs"
+
+update_cargo_toml () {
+	echo $1
+	sed -i -e "s/version = \"$FROM\"/version = \"$TO\"/g" $1
+}
+
+echo "Changing version from $FROM to $TO"
+
+update_cargo_toml ../account_manager/Cargo.toml
+update_cargo_toml ../beacon_node/Cargo.toml
+update_cargo_toml ../boot_node/Cargo.toml
+update_cargo_toml ../lcli/Cargo.toml
+update_cargo_toml ../lighthouse/Cargo.toml
+update_cargo_toml ../validator_client/Cargo.toml
+
+echo $VERSION_CRATE
+sed -i -e "s/$FROM/$TO/g" $VERSION_CRATE